Which years had 100 or 120 mph speedometers?

H22A4 said
I’ve got a 75 Scamp and it has a 100mph speedo. The 1975 parts book doesn’t list a 100 or a 120mph speedo so for sure by 75 it was only 100mph. Likely had something to do with Nixon signing a bill in 74 to help reduce fuel consumption?

Question now is if 100mph speedos were available before 1975 or was it only 120?

Probably depends upon the vehicles.... my '68 A100 has a 100mph speedometer. To be fair, back in the day these things barely pushed 70mph without issues. :p