I wrote a topic about the bracelets on Vintage Heuer forum,
unfortunately the forum closed and article and pictures are lost.

Anyway we built up a classification of bracelets, end links and clasps:

Bracelets are two different types, double grain and single grains.
The first type was for watches of the 60s, so they apply the 2446 screw and snap back, the 2447 Carrera and the Camaro.
Later single grain bracelets are for 1163 and 11630 Autavia (plus manual winding versions 73363, 73463, 73663...), and for the 1153 Carrera (as well as the manual winding versions with same case shape)

All the double grain bracelets have the small clasp, up to 1972.
This also goes on the early single grains, dated 1/69 and 2/69.
The clasp with fliplock has been introduced during 3rd quarter 1969, and i saw both type of clasps with date stamp 3/69.
From 4/69 all single grain bracelets have the fliplock clasp.

About end links, these are different types:

HL - 2446/3646 Autavia screw back case
HEL - 2447/3647/7753/3147 Carrera
HLA - Camaro
HLB - 2446C/7763C/7863 Autavia snap back case
HLC - 1153/1553/7853/73353/73453/73653 Carrera
HLD - 1163 Autavia, early cases from 141000 to 144500, then again on Schmitz "V" cases from 270000
HLF - 1163/1563/73363/73463/73663/741603/11630/15630 Autavia, (for 1163 and 1163V: 202000 to 270000)

This is not a rule, is what i saw and what i know.
I'm obviously open to discuss, clarify and modify what exposed...

Paolo