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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11The Yema Navygraf Super Compressor is a compact, time-only diver-style watch with an internal timing bezel, a compressor-style case-back mechanism and a published 300m water-resistance rating. The blue Marine Nationale Bleu model is reference YNAV24SC-GMS; the black version is YNAV24SC-AMS. The specifications below are manufacturer or reviewer-reported, while the wrist impressions come from Lex Stolk’s December 16, 2024 Fratello review—not an independent test for WatchRanker.
What the 38.5mm Navygraf Super Compressor is
This is the time-only Navygraf Super Compressor, not the separate Navygraf Marine Nationale GMT. The GMT is a different model with a GMT function and separately reported specifications, including a 12mm thickness; those details do not apply to this watch. Yema’s official product page identifies the blue reference YNAV24SC-GMS. Fratello’s review also names the black reference YNAV24SC-AMS.
The design’s defining feature is an internal, bidirectional timing bezel, operated from the crown rather than an external rotating bezel. Fratello describes a compression spring in the case back as part of the Super Compressor construction. That explains the design, but does not establish how the watch performs under pressure.
Published dimensions and movement
Fratello reports the following specifications for the 38.5mm model. These are published figures, not measurements made for this article.
#1 Best Overall
- Stainless steel case 40mm diameter x 14.1mm thick; Exhibition case back; Black dial; Luminous hands.Band Length: 205mm
- NH35A Japanese Automatic movement, 24 jewel; Assembled in Malaysia; Watch weight 155 grams
- Includes gift box, instructions and 3 year limited manufacturer warranty; Invicta Customer Service can be reached at 1-800-327-7682 for questions (re: Additional links, band replacement, band adjustment, warranty questions, etc.)
| Specification | Reported figure |
|---|---|
| Case diameter | 38.5mm |
| Lug-to-lug | 46mm |
| Case thickness | 11.15mm, excluding the crystal |
| Crystal thickness | 2.2mm |
| Strap width | 19mm |
| Movement | YEMA2000 automatic |
| Functions | Hours, minutes, seconds; manual winding and hacking |
| Frequency and power reserve | 28,800vph; 42 hours |
Fratello reports that Yema states an adjustment of ±10 seconds per day before and after assembly. This is a stated adjustment figure, not an independently recorded accuracy result or a guarantee of how a particular watch will keep time on the wrist.
Blue or black: the two reported versions
The source-supported distinction is dial color: Marine Nationale Bleu in blue (YNAV24SC-GMS) and black (YNAV24SC-AMS). Stolk preferred the blue dial in his review, a personal styling preference rather than a claim that one version is objectively better. Choose by the look you want; the available evidence does not establish a performance difference between the two.
Rank #2
- Stainless steel case 43mm diameter x 12mm thick; Black dial; Luminous hands and hour markers
- Japanese quartz movement, PC32 Caliber; Assembled in Japan; SR626SW battery included; Watch weight: 170 grams
- Stainless steel band, 185mm L x 22mm W; Band is adjustable by adding/removing links; Fold over safety clasp
- Flame Fusion crystal; Screw down crown; Uni-directional stainless steel bezel with black top bezel ring; 100 meter water resistant: Suitable for recreational surfing, swimming, snorkeling, sailing and water sports. Not suitable for diving
What the review says about wearing it
Stolk describes the Milanese bracelet as supple and says it feels good once on the wrist, but is awkward to adjust and open. That is one reviewer’s experience, not a universal fit verdict. The reported 19mm width is useful if considering another strap, but check the specific strap’s width and hardware compatibility before buying.
Water resistance and what it does—and does not—tell you
Fratello reports a 300m water-resistance rating. This is a published rating, not evidence that this example was independently pressure-tested or used for diving. It should not be read as a report of hands-on water testing.
Rank #3
- Stainless steel case 42mm diameter x 14.2mm thick; Exhibition case back; Black dial; Luminous hands and hour markers
- NH35A Japanese Automatic movement, 24 jewel; Assembled in Malaysia; Watch weight: 142 grams
- Stainless steel band, 215mm L x 22mm W; Band is adjustable by adding/removing links; Fold over safety clasp
- Mineral crystal; Screw-down crown; Uni-directional stainless steel bezel with black and green top bezel ring; 200 meter water resistant: Suitable for professional marine activity and surface water sports. Suitable for diving.
Price and availability
Fratello quoted €990 / US$990 in its December 16, 2024 review. That is a dated price, not a current offer. Yema’s product page has shown a sale-price snapshot, but prices and availability can change by variant and region; confirm the live listing and terms directly with the seller before purchasing.
Quick Recap
Best Value
- Stainless steel case 40mm diameter x 14mm thick; Exhibition case back; Black dial; Luminous hands and hour markers
- NH35A Japanese Automatic movement, 24 jewel; Assembled in Malaysia; Watch weight: 155 grams
- Stainless steel band, 210mm L x 20mm W; Band is adjustable by adding/removing links; Fold over safety clasp
- Mineral crystal; Screw-down crown; Diver stainless steel bezel with black top bezel ring; 200 meter water resistant: Suitable for professional marine activity and surface water sports. Suitable for diving.
Rank #4
- Stainless steel case 47mm diameter x 14.44mm thick; Exhibition case back; Blue dial; Luminous hands and hour markers
- NH35A Japanese Automatic movement, 24 jewel; Assembled in Malaysia; Watch weight: 310 grams
- Stainless steel band, 215mm L x 22mm W; Band is adjustable by adding/removing links; Fold over safety clasp
- Mineral crystal; Screw-down crown; Unidirectional stainless steel bezel with blue top bezel ring; 300 meter water resistant: Suitable for professional marine activity and surface water sports. Suitable for diving.
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.
