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The BALL RR1803-C is the automatic caliber listed for the Roadmaster Ocean Explorer 41 mm. Its functions include tide indications and a moon-phase display as well as hours, minutes, sweep seconds and a magnified date. BALL’s owner manual also gives a specific caution for setting the moon phase: avoid adjusting it between 3 PM and 5 PM.
Which watch uses the BALL RR1803-C?
BALL identifies the RR1803-C as the caliber in the Roadmaster Ocean Explorer 41 mm, in the DM3120C-S1CJ model family. The official product listing describes it as an automatic, COSC-certified chronometer. The listing associates the caliber with hours, minutes, sweep seconds, a magnified date, tide indications and a moon-phase display illuminated by micro gas tubes.
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The listing gives the watch a 41 mm stainless-steel case, 100 m / 330 ft water resistance, 4,800 A/m anti-magnetism, an anti-reflective sapphire crystal and a screwed-in crown. BALL specifies 29 micro gas tubes on the hands and dial for night reading. These are manufacturer-published specifications, not independent test results.
What should you know about its moon-phase display?
BALL’s owner manual says: “All BALL Watch moonphase complications are calibrated for the Northern Hemisphere.” That guidance applies to interpreting the RR1803-C moon-phase display; the manual does not establish a Southern Hemisphere calibration.
#1 Best Overall
- The ball is already full of air + 1 ball needle
- Great for opening watch cases , Hold the watch in one hand and in the other hand, press the friction ball onto the back of the watch.
- Start twisting to unscrew the watch back.
- 2-1/2 inches in diameter
- and you can fill air by the basketball pump yourself if need full air
Setting the moon phase
The manual instructs the owner to turn the display to the nearest full or new moon, then move it forward by the appropriate number of days. Do not adjust the moon-phase function between 3 PM and 5 PM, as BALL advises against setting it during that period. See the BALL owner manual for the complete instructions.
What price and edition information is available?
When accessed on October 12, 2026, BALL’s official listing for the black-dial DM3120C-S1CJ-BK variant showed a price of US$3,599 and a limited edition of 1,000. Price and availability may change; check BALL’s official listing for current details. This is one dial/reference variant, not a separate caliber or a model-to-model comparison.
Rank #2
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What is not established about the RR1803-C?
The official product listing and owner manual establish the model association, listed functions, manufacturer-published specifications and moon-phase guidance. They do not provide a detailed movement architecture or a separate technical sheet for the RR1803-C. The listed performance figures should therefore be read as BALL’s specifications rather than independent test findings.
Quick Recap
Best Value
- DOESN'T SCRATCH WATCH – Made of durable rubber, our watch case opener ball uses friction to safely open watch backs. Unlike metal openers, it provides a secure grip without any risk of scratching or damaging your watch.
- EASY OPERATION – Simply secure the watch in a repair stand or grip it firmly, then squeeze the rubber ball to create friction with the back case and rotate in the "open" direction. (Note: Not suitable for watches that require prying open the case back directly.)
- INFLATE BY YOURSELF – For safe shipping, the rubber ball arrive deflated. Use the included air needle to inflate before first use—we recommend filling to 90% for optimal grip. Do not overinflate.
- WATCH HOLDER - With the watch holder, the grip area is larger, which can generate more torque and help you open the watch back cover more comfortably and efficiently. In addition, using Ticfrog watch holder is more solid than fixing the watch directly by hand, which can effectively avoid scratching the watch and hand due to watch sliding.
- IMPORTANT NOTE – For watches with extremely tight back covers, this opener ball may not provide enough grip. In such cases, we recommend first loosening the case back with a wrench-style opener, then using the rubber ball to complete the removal.
Rank #4
- 【Stylish Pocket Watch with Chain】Unique pocket watch with fish eye round ball shape and tassels design, vintage appearance design, really good as a fashion accessory. More than a practical watch, also an elegant necklace. Make you charming in all occasions.
- 【Precise and Durable】The pocket watch with hand wind mechanical movement providing accurate and constant time keeping. No battery need. Convenient and long time to use. Durable alloy case and chain. Unique round convex glass for scratch and scrap resistant, and ensures the clearness of time display. It's a practical item functioning as a timepiece for everyday use
- 【Hand-Winding Mechanical Watch】Package includes a pocket watch and a necklace chain with hook; The removable chain is easy to assemble and disassemble. Set time - Pull the crown away from base of the watch and turn it clockwise until reaching the exact time.
- 【Antique Gift】 The Roman numeral watch comes with a gift pouch, functioning as a delicate gift. Great Mothers Day / Fathers Day / Anniversary / Valentine’s Day / Birthday / Christmas/ Graduation Gift for friends, teachers and families.
- 【WAHTE YOU GET】You will receive a watch with a chain, a backup battery(to be changed when the original battery dead), and a velvet pouch. The battery has been installed already. you should remove the white buckle and push the crown inward to make the watch work. If it does not work, you can try to change the battery.
Rank #3
- The Magnetic Levitation Balls Dial on this Unisex Cool Watch is a truly unique and mesmerizing feature, combining cutting-edge technology with a sleek, minimalist design that will surely turn heads.
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- Give the gift of style and innovation with this Magnetic Levitation Balls Dial Unisex Cool Watch, a versatile and eye-catching piece that is sure to be cherished by anyone lucky enough to receive it.
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.
