After months of intensive development and weeks of rigorous testing, they have finally arrived! The engraved 3861 casebacks are now back in stock, and ready to ship!
 
Got a hesalite Speedmaster Professional Moonwatch, and want to see that Co-axial Master Chronometer movement? Swap out the solid caseback with this precision-engineered exhibition caseback, and be able to view the movement at your leisure!

Revolutionary Form:
This new caseback continues to push the boundaries of what is possible. We have carefully engineered an inverted double-bevel profile that reduces the steel volume, allowing the caseback to virtually disappear into your wrist. Of course, it wouldn't be a SWP caseback without an overall reduction in height. This new profile, meticulously optimized for slimness, will reduce your 3861 Speedmaster height by approximately a quarter of a millimeter.
 
How it's Made:
Our caseback consists of an outer ring, which we precision machine from 316L stainless steel. Then, we sandblast the slots for the opener tool to eliminate machining marks. This also provides contrast to the polished double-bevel, a feature of pre-moon references which we recreate on each caseback to stay true to the Speedmaster's roots. 
 
After polishing the double-bevel to a mirror finish, the steel ring is carefully fitted with a scratch-resistant sapphire crystal. We apply a colorless, multi-layer AR coating to it, ensuring clear viewing and photos of your Master Chronometer movement.
 
For the engraved variation, we use a high-power laser to carefully apply the script on the outer surface of the caseback, so you can always remember why the Speedmaster is called the 'Moonwatch'. 
 
If you have any questions, send us a message!