After much research on my super kodiak and your mag too this is what Ive found out.
super mag was made 1966-76
k serial number started in 1970
coin was set flush with riser 1966-72
brass or gold colored coin 1966-70
nickel silver coin 1971-72
raised coin set on top of riser late 1972-76
raised coin was silver or gold
1953 patent date ended in 1972
if your bow has the flush gold coin it is 1970
if the coin is on top of the riser with the 1953 patent date still on it, late 1972
coin on top of riser with no 1953 date 1973-76
hope that helps, but remember I aint no expert, all my info comes from AT, TBM and the net, so dont shoot me if I'm wrong.