I was thinking to buy the very same thing from Josh. My only worry is the A-7750. That's what Josh warns about on his site:
How do you set date on 7750 or 7753 or 7750b1 or any movt with date chrono/ automatic?
Do not activate the chrono until you have done all these steps as mentioned
When you receive your piece, please remember to handwind the piece for about maybe 50 rounds, so to generate enough power reserve. Then you shake the piece like a "mad cow" for 3-4 minutes to generate more power reserve (If necessary)
Then pull the crown out to adjust the hour hand manually to determine when is am/pm. See the date change - then you will know when is am/ pm. Make sure you know when is am/ pm before you proceed
Make sure you do not adjust the date between 10pm-3am ever!!! Do not ask me why because it just works this way. if you adjust between 10pm-3am, the date will jam or go half way.
After u have confirmed the am/ pm…..u can adjust the crown to get to the desired date you want.
As for the timer hand to reset back to zero, it is pure luck….u may have perfect reset, or less than perfect reset. My Genuine Rolex Daytona did not reset back to zero after 3 months. By the way, make sure everytime you activate chrono, you have enough power reserve. Have fun!!!