I suspect you might have to look at photos and specs to narrow it down if nobody who has done the research chimes in. I'm happy to help, as I've wondered myself, but could you provide some parameters to narrow it down? For instance, puretime has ~84 different Patrimony reps. Are you looking for a simple three hander? Date? If so, at 3 or 6 o'clock? B-retrograde day/date? What metal? Dial color? If you think about it and narrow it down, you could compare photos of the dials and overall dimensions to arrive at what you think is best, but it depends on your definition of "best" and what you are looking for.
If you don't have any preferences, then I'd say by eye the FKF Patrimony Date in stainless steel with Miyota 9015 is as close to the gen as you could get.
Rep:
https://puretimewatch.io/watch-bran...-dial-on-black-leather-strap-miyota-9015.html
Gen:
https://www.vacheron-constantin.com...y/patrimony-self-winding-85180-000g-9230.html
Same width as gen (40 mm), slightly thicker (8.8 mm vs 8.55 mm), case, bezel, and lugs all look good. Font and cross look good, as do the markers and hands. Date window appears to be the same size and location. The only real differences I can see are the crown, which is slightly larger in the rep, and the rotor has the wrong color and engraving. However, the movement looks close enough, not that you could expect to find an identical clone on that side.
FWIW, there's also this rep, but the font is not as good, "Geneve" has an accent (gen does not), "Swiss Made" is too large, but this rep is still quite close and the rotor is much closer to the gen in color and engraving:
https://puretimewatch.io/watch-bran...-dial-on-black-leather-strap-miyota-9015.html
The movement also does not look as good as the FKF rep. However, if you were ambitious, you could buy both and put the rotor from this one on the FKF rep.
If you went through every rep could you find a closer one? Maybe, but that's pretty damn close if you ask me. Again, if you have preferences for metal, functionality (3-hander vs. complications), etc. then you might look elsewhere.
Hope that helps.
