blau
3469
Here's the same strap on ye beloved 3706...
accompanying me on a train ride from Osaka to Tokyo a couple of summers ago.

You're right about the 3712. What an awesome watch. It did not get its due during my ownership. Eventually I sacrificed it for a JLC Geophysic, which I sacrificed for a Lange Saxonia Thin, which I sacrificed for a Patek 5110G...
which I own currently!