Interesting topic Amer, as we see the old GF bracelets reaching some high prices, GF bracelets came with the Autavia screw back case and Carreras would guess around mid 60is later also for Camaros and Autavia compressor cases, pretty durable and still safe with some considerable stretch, definetely a high quality product.
With the automatic watches we saw the introduction of the gen 2 GFs with slightly different design and endpieces.
Paolo has written an extensive summary about endpieces with some good research behind.
Regarding clasps: non security at the beginning, later around 1970 there was also a security clasp available on gen 2, however some were delivered without.
In most catalogs the steel bands were offered as extra cost option and quite pricey for the time period. Heuer was not a cheap watch similar positioned to other famous midrange brands.
Your last photo shows a generic GF styled variation, which was partly used on some Heuers, we have seen these quite frequently on Viceroy and Bells at the end of lifecycle.
A timewitness told me that these were produced in China and offered at the time for 1.35 $ to Heuer for purchase. Mostly unsigned clasps and also used by other watchbrands.
Best Arno

Hi All
: did Heuer use a clasp on the Old double Grains Rice Bracelet like
: this one in the 1st picture?normaly they looks like this one l
: the second picture and I found the same Bracelet here in
: switzerland without the Heuer logo like 1st picture
: thanks for any Help
: cheers
: Amer