1956
Good 22.
1954-58
Between 1971-1973.
Impossible to answer without a serial number.
Frame
Value will depend on exact configuration, overall condition, finish, box, manual, accessories, serial number, barrel length, etc.. Range could be from 25 USD to multiple thousands of USD.
The JC Higgins Model 80 was actually made by High Standard for Sears, and is the same as the M101 Duramatic pistol. Made from 1957 through 1961/62. These can be bought on the use marked for $200-$250.
1934. A rather early pistol.
The best that I can do is say that the model 101 duramatic was made from 1955-1970.They were made in both 4.5in barrel,and 6.5in barrel length,s.the total gun production fiqures and date of manufacturing are not available from the now discontinued company.
1971
1,000,000,000