there are three original straps
that I can think of.
Maybe Mike Mounce can help...
there is the original waffle
a ' double ridge' that sometimes came on the 6105 and the 300 6159
and there appears to be another seiko 19mm with a slightly larger waffle.
here are two great post - detailing this out.
Lets take a minute and thank those old posters and collectors for sharing.
this one has some screen stills from a movie that clearly show two waffle straps.
http://larrybiggs.net/scwf/index.php?mod=103&action=1&id=1123468149
and here is a post about the double ridge- that is more common on the 300m
http://larrybiggs.net/scwf/index.php?mod=103&action=1&id=1122514401
I dont think we really need anymore guides. there is such a wealth of info on the mirror.