Hey thanks! It is actually a modern one by Staib and is easily available. I got it with another watch I wrote about on here the other day, My JS Watch Sif NART but realised that it channels the 1960s JB Champion look pretty well so thought I would try it on my Speedy. It works a treat and will likely stay there for a while. Its a crying shame they don't do a 19mm as I would get one for my straight lug if I could. These are German engineered and feel really solid, unlike I am lead to believe the now rather pricey JB originals.
Please be brutally honest - does the blue strap work with the gold watch?
Strictly my opinion, I think the matching strap overwhelms the touch of blue on the subdials. I think a dark burgundy or cordovan with matching line stitch would be nicer with the gold. The blue on the face would actually stand out more too.