this is in my opinion from the photo,s shown a 1990's(93-99ish) model-as the 18k gold body housing the cal 844( base calibre 846) and the stainless steel body with the reverse dial showing the JL instead of the 12 and 6 in the later models.dimensions of case=28.6mm x 20.7mm.
the front dial is silvered guilloche with floral numbers and the blues steel is correct .
reverse dial is mother of pearl centre segment and silvered guilloche with yellow gold dauphine hands is correct
also the 32?(not counted them you can do that) diamonds set of the reverse case is also correct
it also has the correct crown.
the folding clasp is also correct with the logo in stainless steel
by looking at the finishing of the case, dials,hands,crown from the photos say that i would be pretty sure it is genuine but once the watch maker has a closer look can give a confirmation
i can give you the 1993 rrp american(colonial cousins) price of it new then of $4850.
by the way the original had a red leather strap.
hope this helps-i accept no responsability-only my opinion from the photo's