: The register capacity is absolutely the right thing to go by in
: aging a Camaro (or a Carrera or Autavia come to that).

: The Camaro seems to first appear in catalogues in 1967, as either a
: 7220 Camaro 12 sporting 3 registers with max 12 hour recording
: capacity (and the very rare 7228 18K gold variant) or a 9220
: Camaro 45 with 2 registers and 45 minute capacity. The range
: thus mirrored the already existing Autavia and Carrera 12 and 45
: ranges. The Camaro also used the same stalwart Valjoux movements
: as those existing models too - Val 72 for the three-register
: models and Val 92 for the two-register 45s.

: Then, in the 1970 catalogues, watches powered by the Valjoux 7730
: replaced the 45s in all three model ranges. These new watches
: have 30 minute recording capacity and Heuer referred to them as
: Camaro 30s for that reason. The 12 models continued alongside
: the 30s, still using the Valjoux 72.

: The 7730 was superceded by the 7733 pretty quickly, as reflected in
: the model designations for these watches - 73343 (steel) and
: 73345 (gold-plated), the first three digits designating the
: movement in the watch. It should be noted that the 7730 and 7733
: don't feature a date wheel, so for Camaro 30s with a date
: window, the movement is actually the 7734 and correspondingly
: the model number becomes 73443 as a result.

: Here's a page from the 1970 US catalogue showing these Camaros:

:
:

: So the Camaro 45 would appear to run from 1967 to 1969, with the
: Camaro 45s from 1970 to 1972, which is when the model last
: appears in Heuer literature.

: Hope that answers your questions, but feel free to add any others!