Here's a start. Should have 2 codes 1 part number, 2 Julian date code. 1962 should be the 196th day of 72
Look for the second number as it will reveal what vehicle the booster is off of.
I don't know about the later years, but 64-67 boosters all have a 3-digit
date code, which only gives you the julian day of the year (but not the calendar year). The 4-digit stamp is (depending on the year) either a partial part number or an application code.
If I remember correctly, on 64-65 boosters the 4-digit code is actually the last 4 digits of the assembly line part number for the complete booster-master cylinder assembly (which arrived at the assembly plant from Delco Morraine as a unit), such that the 4-digit stamp will match the last 4 digits of the part number shown in the J50 section of the AIM. Need to double check that though.
I cannot remember if 66 was done like 64-65 above, or like 67 (see below).
On 67 boosters the 4-digit code does not
correspond either to any assembly line part number for the complete booster-master cylinder assembly shown in the J50 or J52 section of the AIM, or to the service replacement part number of the booster itself shown in the parts books from 1967. Presumably the 4-digit code corresponds to the complete booster/MC assembly somehow, but it does not appear to be based on any part number.
I have Delco brake parts catalogs from 67 and another one from 1969 or 1970, that have gobs of really good data in them, but I have not had time to study them to see if they give the booster application codes for 67 and later years.