Thanks!!!
I got it back in the summer for £100 on eBay.
It's a D.S & S #1560
The curve on the end piece isn't huge and it's probably not meant for this case, but it looks fine.
Sinn 104 St I - special edition - satin finish. Fantastic customer service from Watchbuys. This is my third Sinn purchase from them and this 104 had a problem. They took care of it right away and replaced the watch with out a hassle. I changed out the original strap to one purchased from Holbens - a Hirsch Performance Robbie strap. Super comfortable and I feel, fits the watch
. The 104 feels right in the satin finish - the original polished version never clicked with me.
A Seiko 5717 one-button chrono from 1964, out for a walk along the canal on a sunny winter's afternoon; I think I read that this was the first chronograph produced from Japan.