Another rare late version 1997 Sinn 156 German military watch . Lemania 5100 cal . T Swiss Made T dial. With certificate and box lack original bracelet . With two NATO straps. Watch over 90 percent condition
https://vintage-sinn-collector.com/en/sinn-156-military-en?
https://ghostofgeraldgenta.com/2021/07/16/sinn-156-and-sinn-156b/

https://wornandwound.com/finally-sinn-revives-an-iconic-military-chronograph/