help with identifying binoculars

Hello folks,

Can you help identify my director binoculars, rough dimentions 22cm x 26cm x 15com. similar to these

no identifying mark other than "trochen luft" and some pencil arithmentic on top. Also have leather carrying strap. The eyepiece are is roughly as above but the large lens area is a bit different Not as covered by the casing. I'll post photo's when I can. Any help greatly appreciated. The above picture is fro the Deutsch Optik site.

Cheers

 

I have done a bit of research. I discovered the flm code is for the Feinapparate-Bau Werk, Thurn, a Zeiss Jenna factory. The code Number is flm 283566. Any information would be appreciated.