....in case it's of use to anyone, I've had a few direct replies on this and the general consensus is YES-whether fluted or round, the caps themselves can be switched between pushers/models. Whether that spans the whole of the '50s/60s/70s is unclear, but certainly pushers caps from models of a similar period can be switched.....I am told!

Steve

: Hello all,

: I was having a chat with another member about fluted pusher caps
: for an Autavia, he believes that while the pushers themselves
: may be different dimensions, the caps were probably the same
: size and interchangeable between Heuer models. Does anyone know
: if this is the case?

: Further, is this the same for the round pusher caps also-i.e.
: manual 60s Carrera/Camaro/Autavia etc..?

: Many thanks in advance!

: Steve