This is some information that I have found at Russian forums.
It is about R-60 and R-60M missile -family-. In Soviet army, R-60 was the "generic" term for rear-aspect missile based on K-60 frame, and R-60M for all-aspect. Those "gothic" marks make the difference
List of R-60M modifications in 70's and 80's. Note that some were not in serial production!
R-60M (mod 62), Dec 1975.
R-60 differences-Warhead mass increased from 3 to 3.5kg with prefragmented-wolfram warhead. Lethal cone increased from 2.5 to 4m.
Cooled seeker "Komar-M" (OGS-75). Acquiring increased from 12 to 17 deg (24/34 deg total). Seeker has FOV of 5 deg and tracking speed of 30-35 deg/sec.
Engine is booster-sustainer type, five burning channels, duration 1.4-1.5sec. Increased accel. and range. Sustainer that starts 0.1-0.2sec after booster, burns 0.8 sec. Speed cca. 1000m/sec.
R-60M (mod 62P), 1975. Modification for MiG-25 interceptor. Seeker cone of thermoresistant glass. Vacuum between glass and seeker.
R-60M (mod 62M), 1977.
Seeker "Komar-2" (OGS-75M), tracking increased from 17 to 25 deg (34-50 total). Optical main fusing. "Kolibri" passive fuse removed, fuse with launch aircraft radar freq modulation installed (passive). Turbogenerator. New sustainer 4.4 sec. Speed cca.1050m/sec.
R-60M (mod 63), 1982. No data, probably prototype.
R-60M (mod 63M), 1983.
New bi-spectral seeker (no other info, probably measure against jamming). Induction fusing (probably from "Igla"). Introduced launch with initial pop-up (probably for use with helicopters). Sustainer is delayed if no pop-up is needed. Active flight-11 sec.
R-60M (mod 63P)
R-63M mod for interceptors MiG-25&31, adaptation as for R-62P.
R-60M (mod 63R), 1986.
Variant for Su-24, three-point initial guidance with IR seeker acquire on mid-course.
R-60M (mod 63V), 1989.
Based on mod 63M. Tracking system coupled with radio-receiver for "Ataka" system.
R-60M (mod 64X, X means various submods), R-60M missiles from mid-nineties vintage upwards.
Export versions have "K" designation after the main designation. Main difference is that it has not "secret" pre-fragmented warhead, but common wolfram rods.
Seeker has FOV of 5 deg and tracking speed of 30-35 deg/sec.
I have "remodded" existing R-60 according to this and additional data. It gave interesting results, mainly because of interesting physics of real missile, but I will write more about it if any interest is shown