Here is a list of the JMC frames and approximant dates they were made. 11 different frames were made.
1976 Six or more Prototypes. Short JMC Standards and Long JMC Standards.
4/6/1977 1st production Short JMC Standard for David Wilson JMC1
6/15/1977 1st production Long JMC Standard for Clint Miller JMC20
1978 Tear drop forks
2/7/1980 1st JMC Mini JMC1801
3/25/1980 1st JMC Black Shadow JMC2175
( I don't remember when we started using the K)
5/16/1980 1st JMC Special Later named 3.1XL by Matt Raymer of Oklahoma JMC2457
9/19/1980 1st JMC Chrome Bike JMC Mini JMC2815
9/19/1980 1st Bike to use the name 3.1XL Chrome sold to HUTCH MX Racing XL3181
11/25/1980 1st Chrome JMC Shadow Scarlett's Schwinn K3733
7/1981 1st Red JMC Shadow for DY k6097, k6098 was also Darrells but black
1/12/1982 K8201 was the first frame to use the first 2 numbers as the year
1/14/1982 1st JMC 16" Pit Bike Jason Wharton Chrome P16-1 (110 made)
Feb/1982 Production colored JMC Shadows
4/1982 1st 24" JMC Cruiser made
9/15/1982 1st JMC JR Mini The JR was for Justin Roos only about 54 made
10/24/1983 1st Darrell Young Design DYXP 1 and DYXP 2 both red.
April/1984 1st JMC Micro Mini. I think there was 85 made.
8/2/1984 1st JMC Andy Patterson Series 278 made in 1984 & 55+ made in 1985
K3733 was the 1st Chrome Shadow
Courtesy of Jim Melton