About 1957-58
1956
1956 570,813 shipped 7/21/1956
1954-58
Between 1971-1973.
To determine the age of a Hi-Standard M-101 Duramatic pistol, you can check the serial number, which is typically located on the frame. The manufacturer's records and known production ranges can help pinpoint the year of manufacture based on the serial number. Additionally, inspecting specific features or markings that were only present during certain production periods can provide further clues to its age. Consulting with a firearms expert or collector can also aid in accurately dating the firearm.
With the serial number that you have provided,your Hi standard M-101,.22cal pistol was made in the year 1955.
1968 2,030,404 Above was first serial number for 1968. Following year began with 2,172,356.
Impossible to answer without a serial number.
Contact High Standard with the Serial Number and they will tell you when it was manufactured.
1968
@1968
1963