Panerai, Victorinox Swiss Army Airboss Mach 4 (pictured), too many to list…add your watch in the comments below
The ETA/Unitas caliber 6497 is a Swiss made mechanical manual wind movement with 17 jewels. This movement is often confused with the ETA/Unitas 6498. This caliber is one of the most popular hand-wound mechanical movements in the watch industry. The 6497 is often referred to as a “pocket watch movement” because that is the origin of the design. Thanks to its large diameter, the 6497 is often found in flieger style pilot watches.
The 6497 is a non hacking caliber, but there are brands (such as Chronoswiss) that have heavily modified base 6497 movements and added hacking mechanisms. If you know of a specific 6497 based caliber with an additional hacking module added, please mention it below.
The 6497 has a set lever detent screw to keep the stem in. In order to remove the crown and stem from the movement, first pull the crown out one click to time setting mode. Locate the small screw near the stem (see image below). Very carefully unscrew to loosen it, but do not go too far to fully remove it – unscrewing too much will likely result in screwing up (pun intended) the keyless works, which means pulling off the hands and dial to put the set lever back in place.
In ETA’s own words: “First pull the winding stem to position 2 (time setting), then unscrew the screw (see marking) a maximum of 2 turns to loosen the setting stem.”
Watches With This Caliber:
The movement pictured above is from a Victorinox Swiss Army Airboss Mach 4. Please add yours to the comments below.