Actually most K-frames did not have a coin. I've probably had up wards of 50-60 K-frames over the years and only a few had a coin.
Did just sell a 1970 B frame with the 90 coin on it.

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72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, .
Moparmarks Parts & Restorations
Desert Mopar Metal
Grand Jct. CO
970-261-7039
http://moparmark.com/
motormangj@gmail.com