[Smersh]

from FAS

T-62A: Besides the standard 7.62-mm PKT coaxial machine gun with a range of 1,000 meters, the T-62A version features a 12.7-mm DShK antiaircraft machine gun with a range of 1,500 meters against ground targets and a slant range of 1,000 meters against aircraft. The T-62A also has a stabilized main gun, which enables the gunner to track and fire on the move with significantly improved accuracy.

T-62K: Command tank models also have a land navigation system which includes a gyroscopic compass and a calculator giving continuous enroute readout of the tank's location (in relation to its point of origin) and its distance from and azimuth to a predetermined objective.

T-62M adds protection, FCS and ATGM capability.

T-62 variants with a V-46 T-72-type engine add -1 to their designation.

T-62M1: Variant with Volna FCS but no missile launch capability.

T-62D: Variant with the Drozd APS vs ERA.

T-62MK: Command variant.

T-62MV: Version with ERA in place of the bra armor. The ERA includes Kontakt ERA and Kontakt-5 2nd-Generation ERA.

From wikipedia

T-62 - early production version, had a 14.5 mm KPVT machine gun in coaxial mount instead of the more common SGMT 7.62 mm.

T-62A - Added 12.7 mm anti-aircraft machine gun (which is often removed in the field) and changed coaxial machine gun to PKMT 7.62 mm. Also added was a stabalized main gun which let the gunner fire while moving with significantly improved accuracy. Though still when firing ATGMs from the gun it would need to make a quick stop. All T-62s in Soviet service were converted to these specifications before 1970.

T-62K - Command tank with additional communications gear, recognizable by multiple radio antennas instead of just one.

T-62M - added laser range-finder, reactive armour.

T-62D - added 9K118 Sheksna laser-guided antitank missile system (AT-12 Swinger), which is fired through the gun tube.

T-62MV - T-62D produced for export, most of which were given to North Korea and Syria as military aid.