about 1953
1952
The lower the serial number the younger the pistol is
It is a Challenger. A Medalist would have the product code of "T" in the sn.
1970
What model?
Depends on the model and serial number.
NO
Pistol made in Belgium
1978
Actually, the Nomad was introduced along with the Challenger and Medalist in 1962. Your pistol was made in 1966 which is denoted by the 6 after the p in the serial number. The nomad was only made from 1962 -1974. The price for the 1962 Nomad was $49.95.
The letter "u" in the serial number indicates it is a Challenger
Impossible to do with just the sn.