: Thanks for your interest :)

: If you look at the pictoral review of Heuer Bundeswehr from
: W.A.Manning (link bellow), the dial of mine is the sixth with
: standard Heuer logo (no small T, big 3H and cut-off hour
: markers), the same as the first Sinn branded dial (except for
: the logo, of course).

: The case of mine has unstepped lugs, like the first Sinn Bund
: presented on that page.

: It has no engraving between the lugs neither at 6 nor at 12.

: By the way, I also noticed on that page that the same kind of
: pushers are found on the Cal.12 Heuer Bund prototype, and also
: on the valjoux 7750 chronograph from Italian Air Force.

: Nevertheless, if I compare the case of mine to the case of a Sinn
: 156, it really the same, except for the thickness (the bund is
: thiner). Same lugs, same psuher holes etc...

: Concerning the movement, I do not have the proper tools to open the
: case without risking to damage it, but i'd like to. It is
: supposed to be a valjoux 230, the flyback functions without
: problem, but I don't kno if there were different versions of the
: movement (I believe there were).

: I made a few new pictures to better show dial, lugs, etc...
thankd to you !!
these watches are fantastic , so it's a pleasure to study and discuss about them.
so your watch has neither reference and case number :
1) the lack of the engraving is not strange as in fact this is not a 1550 SG case due to the many differences we have pointed out.
2) what is not easy to understand is the lack of the case number.....
when you will open the watch could you please take also a picture of the back inside ??