see
fas link
the t-62A designation (as used by NATO, presumably not the WP!!
- seems to assign the A designator if it has the AAMG.
Similar to trying to decipher German WW2 designations of T-34s vis-a-vis the Soviet ones I suppose!
Any further discussion of t-62 designations should really be put into the dedicated thread or this one witll drift off-topic.
Andy