anon438
429
And it is ... a V&C 'one of' in 18k Gold
There is one further source which described the example as follows:
Antiquorum N°128 - 13 novembre 1994 - Lot N°134
"Vacheron & Constantin, Genève, No. 397862, case No. 258659, sold to Mr. F. de Groot on 20 July 1933.
Very fine and extremely rare, early, waterproof, center second, tonneau shaped, 18ct gold gentleman's wristwatch.
C(ase). massive, polished, decagonal bezel, screwed back, lapidated band.
D(ial). white enamel (slightly chipped) with painted indexes. «Moderne» gold bands.
M(ovement). 12 1/2''' rhodiumed, 18 jewels, lever escapement, cut bimetallic balance adjusted to 5 positions, Breguet balance-spring.
Dial, case and movement signed. In very good condition. Dim. 32 x 39 mm.
...
It does not appear in the Registers that any other watch of this kind, bearing screwed bezel and back was ever made."
Source: The book 'The Art of Vacheron Constantin' by Antiquorum Editions, 1994 (and
www.lacotedesmontres.com but incomplete)