No bro, its not mentioned anywhere other than the dataplate on left hand side of the steering wheel. The mutt production was as;
M151 - 1960
M151A1 - 1964
M151A2 - 1970 - 1983(late).
1982 onwards was for export only, mainly to Pak, Sudan & a few other countries. Pak Army only got M151A2s, which included a large number of M825 variants used with the 106mm RR gun. Later on TOW missle were fitted on some. Straight M151A2s were lessor in number.
Post a few pictures of your ride, as it is now