Sweet! That's the original model or first series. Where did you find it? Looks nice. Congrats and enjoy.
The black and red one is what Steve made for me back in 2011. I had to measure everything with a caliper and give him the specs because he had never made one for this watch before. The yellow is another he made later on for someone else. He has done quite a few since the first one. His prices are very fair, usually about $50.
http://www.steveostraps.com/
https://www.instagram.com/steveostraps/
The first series used the eta 2836
I don't know if mine is a first series, but if it is and it has a 2436 I would that as a plus