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Redline Squareback First production bike was serial number 100. By the 500-600 range somewhere begin the 1975's.1974-1975 Front gusset had no hole1976-1977 Front gusset had two holes1978-1979 MX-II - 4130 frame/fork. 1990 Three (390) - 18th Anniversary model, uses a Series-III type frame. Available in Red/Gray, Blue/Gray, Yellow/Gray & Black/Chrome1990 Four (400 EXL) - Series-III type frame. Available in Red/Gray, Blue/Gray, Yellow/Gray & Black/Chrome1990 Seven (700SL) - Proline type frame. Available in Red/Gray, Blue/Gray, Yellow/Gray & Black/Chrome.1991All Have commemorative sticker stating 1972-19911991 320 - 1991 420 - Available in Chrome, Red, Yellow or Blue. Available in Yellow/Gray, Blue/White, Red/Gray(or Chrome)1991 720 SLX - Available in Yellow/Black, Red/Black, Blue/White(White or Black being the back end color)19921992 Redline Platinum - 20th Anniversary Edition. Browning front suspension.19931993 RL 340 - 1993 RL 440 -1993 RL 540 - 4130 frame/fork.