1968 2,030,404 Above was first serial number for 1968. Following year began with 2,172,356.
1956
1954-58
Between 1971-1973.
With the serial number that you have provided,your Hi standard M-101,.22cal pistol was made in the year 1955.
@ 1968
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.
1955
About 1961.
1974
1967
1958