Simon:

Thanks for the inquiry and for the kind words about this Discussion Forum.

Great looking chrono!!

It is a fairly close match with some shown in the 1945 Heuer catalog (linked below), and I would guess 1945 to 1955 as an approximate date range. In this era, Heuer did not generally mark the cases to show a model reference number. Perhaps a serial number; but not a model reference number.

The chronograph mechanism on these models does have a crisp, light feeling compared with later models.

Thanks again for the inquiry,

Jeff

+++++++++++++++++++++++++++++++++++++++++++++++

: Grateful if any one can shed light on this
: little beauty; model, date etc. (see web
: page)

: It's an automatic in full working order and
: apparently 'triple signed' although there
: are no exterior markings.

: and the chrono buttons are a lot easier to use
: than my current TH Carrera...

: Thanks again.