Erich,

Your "Astra" comment got my research juices flowing. I just could not feature having bought a Spaniard (Fie on me)! Upon further research:

The Standard Catalog of Colt states that, as a result of the '68 GCA (no more importation of little-bitty pistols), this pistol was re-introduced as an American made product in 1970 and was produced for 2 more years.
So, I reckon the 1973 shipping date, as per proofhouse, is plausible.
Astra or Colt, I agree, it's a handy little unit!

Regards,
(Ilike'mericanstuff)Mike