:hehehe:
Welcome to the rep game, son. Pull up a chair and sit with us a while!
Sadly, most of our reps come from makers with next to no quality control; and quite often a watch is received with issues or even DOA - I experienced it myself with my
first TD purchase of a 111 - But don't be disheartened! You've joined the right forum with a network of fantastic indivuduals, modders, watchmakers and dealers alike!
Forgive my condecending tone if you already know about the intricacies of mechanical watches.
It sounds like there's an issue with what we call the 'keyless works' - A funky assembly of intiguingly shaped pieces of steel, springs, and a couple of gears. Thankfully, Keyless works issues are fairly commonplace and can even happen completely at random. Since you indicated that datesetting and winding function okay, I'd wager that the issue is with a barrel shaped gear called the castle wheel not correctly engaging with the setting wheel - Usually this is because of incorrect assembly or a damaged part/spring.
You have several options here,
*Look for a rep-friendly local watchsmith to undertake the work - this should be fairly cheap
*Send it back to the TD for a swap, possibly at the cost of postage and waiting months for the replacement to be issued
*Undertake the repair yourself if you feel brave enough - (Annoyingly, I can't find the 7750 repair thread anymore, but I have screenshotted it. You're more than welcome to shoot me a PM if you wish to see them
)
Also, one very important thing with this watch (or indeed any containing the A7750/Valjoux 7750, rep or gen - DO NOT SET THE DATE BETWEEN 7PM AND 2AM - Else you will damage the date wheel, and this is often a costly repair.
Hope this helps, and I hope the issue's resolved swiftly - the 243 is a beautiful watch which has been fantastically replicated and it'd be a shame to have to keep it from your wrist any longer than is needed.
- Jeorge