I just picked up a pre-owned 104 and it arrived today.
Unfortunately, the black leather strap was a S small size, no good for me.
Fortunately, I had a Santoni leather strap lying around that I'd previously picked up for my IWC Mark, but never used. Plus I love the contrast of black dial/brown leather.
This is my third Sinn, I previously had a U1, then a 556I.
This 104 is my favourite, love the stark military design, and the case design and dimensions are perfect.
I think this one will remain the one and only German watch in my collection.
Now, pics, or it never happened...