With many thanks to fellow collector Anthony, the original bracelet for the 67-9313 Chronograph, nick-named the Speedy, has been identified 🙂 For the first time I have a good scan from Anthony which clearly shows the bracelet………
And this image, from a 1978 catalog, does confirm that the bracelet Steve and I thought was original with our white dialled versions is indeed the correct one – here’s the post about it from August 2015 : https://sweep-hand.org/2015/08/11/the-original-67-9313-speedy-bracelet/
So finally this question has been answered and I can add the catalog pic to the chronograph page. Thanks again Anthony 🙂
One odd thing about the catalog image is that the push-buttons on the black dialled model are shorter than the white, and the crown looks smaller too. However, according to my case parts catalog from 1977 the part numbers for the two models are exactly the same…..