Very good Jim. Just one comment: two versions of this movement were made (each of which was either ‘clef’/key-wound or ‘remontoir’/stem-wound. The difference was that some had an alarm – which in French is réveil, hence the ‘REV’. Image below.
This movement is not a REV, so it is a 42.9 8-D CLEF 15p version (the movement was made by Lemania).
A successful movement – which replaced the 59-8D SCS (later Cal.120) jump second movement. So the clocks appear similar – but the 42.9 clocks are of course smaller.
As Foo2rama points out, the OXG marking gives it away as having been for the US market. Indeed most (maybe all?) of the 42.9 clocks were intended for the US market – with dials that were appropriate.
There were many different dials for both the 59-8D SCS and the 42.9 – and JPM was involved in the production of some of these (and then signed ‘JPM’). But there were also many (the majority) that were not JPM. And his dials were also on 59-8D SCS clocks that were not specifically for the US.
And only in passing, Jean-Pierre Matthey-Claudet was clearly very skilled: before his (later) years creating not only dials but also other artistic items, he was ‘master watchmaker’ with Omega, involved in the design and production of the 30mm and later the 30i, amongst other things.
Sorry, a long answer! Tom
