11 Ott PROTEX D.U.
CASE Chrome plated , 34 mm .
BACK . Screw, steel .
In addition to the S/N it shows “wasserdicht “ and “stahlboden “
MOVEMENT . AS 1130, no name
PUNCHING . D .U. only .
Letters are larger (2mm) than numbers (1mm) .
S/N . Only four watches were registered and all were punched D. 497 U
It is very strange that all registered watches have the same S/N but it is even stranger that
this S/N appears on Flora D.U. ( not available on this blog ) .
Over the years I have registered 3 Flora DUs and all with the same S/N (497).
This fact may give rise to some doubt about originality of this watch but , on the other hand ,
this number ( 497) is probably not a S/N but a builder’s code ( i.e.: Helvetia , Frenca ) .