At the great risk of seeming silly, I might be able to add a bit more to this thread
The engraving of the serial number on the case echoes that of several illustrations in Hartmut Zantke’s book, see pp 233/290/364/379
No reliance can be placed on the apparent chronology of Ls Audemars serial numbers. Why and when they assigned certain numbers remains an abiding mystery to a lot of folks more qualified than me. (Personally I believe they used an early form of lottery machine).
As I say I am no kind of horologist, but the basic lay-out of the movement seems to me to echo the illustration on Zantke P227, which he dates to 1852. But here I am probably being really silly.
I have one Georges Reymond working for Ls. Audemars in the Vallée de Joux. The only reference to him is dated 1848 but that doesn’t mean much as our records are not complete (see Workers & Operatives | Audemars ) and some of the names appear and disappear from year to year.
It is clear from more recently discovered books that they made anything for anybody, fusée, cylinder, anchor, key or stem – whatever. Often without even assigning serial numbers at all.
(Sometimes I wonder why they didn’t go broke much earlier!)
I’m wondering if the "George Reymond" on this watch is an inscription rather than a maker’s mark……?
Was he doing a bit of homework?
Audemars | Louis Audemars & Cie, Master Watchmakers, 1811 – 1885