The Bremont Terra Nova 40.5 Jumping Hour Aventurine pairs a deep-blue aventurine dial with a frosted 904L-steel case and a jumping-hour display. Bremont says it is making just 50 worldwide. It is a dressier, small-run take on the Terra Nova field-watch design, but the brand’s available US page does not establish the watch’s current price or stock—check with Bremont or an authorized retailer before buying.
What distinguishes the Aventurine edition?
The defining change is the dial: Bremont describes a deep-blue aventurine surface with natural mineral inclusions that give it a starry appearance. The company says each dial is diamond-cut, hand-polished and mounted on a metal backing plate for strength and stability. The official product page is inconsistent in one passage, where it calls the dial gloss black; its title and dedicated dial descriptions identify the Aventurine version as blue, so the blue aventurine description is the clearer model identification.
The case is 40.5mm frosted 904L steel, paired with a leather strap. Bremont calls this its first frosted 904L-steel case and describes its micro-faceted finish as catching light across the cushion-shaped case. The brand presents the combination as a more decorative interpretation of the Terra Nova Jumping Hour rather than a different display concept. Bremont’s Aventurine product page
How does the jumping-hour display work?
A jumping-hour watch shows the hour in a numbered aperture rather than with a conventional hour hand. At the hour change, the displayed number advances to the next hour; a separate minute display makes the time readable alongside it. Bremont identifies the Aventurine’s movement as its exclusive BC634 jumping-hour calibre and says its hour and minute apertures are arranged for a left-to-right reading flow.
#1 Best Overall
- Vintage case, 5atm waterproof, with soft leather strap
- The watch uses the Seagull ST17 automatic movement, which we re-adjust to achieve accurate timing
- The simple dial design, popular salmon dial and classic white are two color options to suit any match you wear
- Classic retro size: Case diameter: 38mm lug to lug: 47mm
- We offer portable packaging, watches are the best choice for your gift
On the related standard 40.5mm steel model, Bremont places the hour and minute windows at 9 o’clock and uses a central running-seconds hand. That layout helps explain the family’s display, but Bremont’s Aventurine page does not confirm that every aperture position and hand detail is unchanged on this reference. The related standard steel model’s specifications and layout
What is confirmed about the movement and dimensions?
Bremont names the Aventurine movement as BC634, but does not provide a full technical specification for that exact reference in the available product information. The related standard steel 40.5mm Jumping Hour is specified with calibre BC634AH, 29 jewels, a Glucydur balance wheel, Anachron balance spring, Nivaflex mainspring, 28,800 beats per hour (4Hz) and a 56-hour power reserve. Those figures belong to the related steel configuration; they should not be treated as confirmed Aventurine specifications unless Bremont verifies they apply unchanged.
Rank #2
- Premium Stainless Steel Construction: 316L stainless steel case with screw crown and steel closed caseback for durability and longevity
- Seagull ST1721 Jump Hour Mechanical Movement: Features reliable automatic mechanical movement with unique jumping hour complication
- Comfortable Genuine Leather Strap: Equipped with genuine leather strap and pin buckle for secure and comfortable wear
- Sapphire Crystal Protection: AR coated sapphire crystal provides scratch resistance and clarity with diameter of 39mm, case thickness of 10.4mm, and lug to lug measurement of 46.8mm
- Standard Band Width: 20mm to 18mm band width allows for easy strap replacement and customization options
The same standard-model page lists a 40.5mm case diameter, 47mm case length, 10.15mm depth and 22mm lug width. Bremont’s Aventurine page confirms the 40.5mm diameter, but not those other dimensions. Confirm them with the brand before relying on them for fit or strap replacement. Bremont’s 40.5mm Jumping Hour collection listing
How limited is it, and what does it cost?
Bremont says the Aventurine edition is limited to 50 pieces worldwide and includes a specially crafted wooden presentation box. The available official US product-page text confirms the configuration but does not establish a current US price or order status. A UK page shows £4,250 in the Aventurine page context, but the available information does not clearly establish that as the current price for this exact reference. Ask Bremont or an authorized retailer to confirm the model-specific price, stock and delivery options for your region.
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- A unique push-button calendar adjusts the hour numerals. A fan-shaped window at 12 o'clock displays the hour numerals, which rotate to indicate the hour hand. A large central disc displays the date, with a circular date indicator and a separate small seconds indicator at 6 o'clock.
How does it compare with the standard steel model?
Bremont’s current US collection listing prices the standard 40.5mm steel Jumping Hour at $4,000 on leather or $4,300 on a steel bracelet. These are comparator prices, not prices for the Aventurine edition. The principal confirmed differences are the Aventurine’s blue mineral dial, frosted 904L-steel finish, leather strap and 50-piece worldwide limit.
| Detail | Terra Nova 40.5 Jumping Hour Aventurine | Standard 40.5mm steel Jumping Hour |
|---|---|---|
| Dial | Deep-blue aventurine; diamond-cut and hand-polished, according to Bremont | Black, according to the standard model page |
| Case | 40.5mm frosted 904L steel | 40.5mm steel |
| Strap or bracelet | Leather strap | Leather strap at $4,000 or steel bracelet at $4,300 on Bremont’s current US collection listing |
| Edition | 50 pieces worldwide, according to Bremont | Edition size not stated on Bremont’s cited pages |
| Movement details | BC634 jumping-hour calibre named; full specifications not stated on the Aventurine page | BC634AH; 29 jewels, 28,800 bph (4Hz), 56-hour power reserve and further components listed by Bremont |
| Price and availability | Current US price and stock not established on the cited page | $4,000 on leather or $4,300 on bracelet on Bremont’s current US collection listing; stock not stated |
Who is this edition for?
The Aventurine makes most sense for someone who wants the unconventional time display and case shape of the Terra Nova Jumping Hour, but values a distinctive dial and a limited production run over the standard steel model’s simpler presentation. The 50-piece limit and hand-finished mineral dial give it a particular visual and collectable appeal; whether that merits its eventual quoted price is a personal decision, and the exact-reference price needs confirmation.
Quick Recap
Best Value
- A unique push-button calendar adjusts the hour numerals. A fan-shaped window at 12 o'clock displays the hour numerals, which rotate to indicate the hour hand. A large central disc displays the date, with a circular date indicator and a separate small seconds indicator at 6 o'clock.
- A 40mm automatic watch—a fusion of exquisite craftsmanship and timeless design. This automatic watch is not only eye-catching but also elegant and precise. Powered by the Seagull ST1716 automatic movement, it ensures precise timekeeping, making every moment count.
- The dial features a retro, minimalist design with distinctive hands for easy readability. The case is crafted from durable, scratch-resistant 316L stainless steel, while the sapphire crystal effectively protects against daily wear and tear. The 40mm case, measuring 13.6mm thick, exudes sophistication and elegance, adapting to a wide range of wrist sizes.
- Water-resistant up to 5 ATM, it withstands everyday activities, including handwashing and brief exposure to water. The high-quality leather strap ensures a comfortable fit, offering an optimal wear experience that combines durability with style.
- Water-resistant up to 5 ATM, it withstands everyday activities, including handwashing and brief exposure to water. The high-quality leather strap ensures a comfortable fit, offering an optimal wear experience that combines durability with style.
Rank #4
- 【Vintage-Inspired Jumping Hour Mechanism】 A classic jump hour watch with vintage character, powered by the Seagull ST1721 mechanical movement. Unlike traditional hands, this watches displays the hour in a window, jumping precisely at each hour change. Important – Time Setting: Always advance the minute hand clockwise only. Do not turn the minute hand counterclockwise, as this may damage the movement.
- 【Classic 39mm Size for Daily Wear】 39mm case, 20mm genuine leather strap. Total watch length is 260mm, fitting wrists from 160mm to 200mm comfortably. Real wrist test (180mm): The buckle sits at the middle hole, with 3 spare holes on each side – easy to adjust for a looser or tighter fit.
- 【Jumping Hour Characteristic (Normal Behavior)】 Due to the gear function of the Seagull movement, the hour may sometimes jump at 57 minutes instead of exactly 60 minutes. This is normal and does not affect accuracy or functionality.
- 【Premium Materials – Sapphire Crystal & 316L Steel】 Scratch-resistant AR-coated sapphire crystal, 316L stainless steel case, and screw-down crown. Built for daily wear with 50M water resistance (rain, sweat, splashes – not for swimming).
- 【Great Gift for Watch Enthusiasts】 Available in multiple colors. Comes in an box – perfect for birthdays, anniversaries, Father's Day, or as a unique gift for a watch lover.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
