Soviet OBB T-62 designations

[Smersh]

In the Russian OBB units number 18, 19 and 20 use a un-common designation scheme.

Unit 18 is called the 'T-62M', the more common name is the T-62A, unit 19, is called 'T-62 M1975' the more common name is T-62M. Unit 20 is called 'T-62 M1984'. which is just another variant of the T-62M with newer model ammunition

this isn't a major issue, but it just simplifies T-62 designations and makes them agree with a majority of sources.