Here is a close up picture of the frame serial number on my 1971-1972 Steens Taco - Super Trail 100 Mini Bike so others people can compare it to there product run number. Just to be totally clear the serial number is S265 & I have no clue how to tell what year it is because there is no date code. I never seen a Super Trail 100 frame serial number that has a date code before the model & production number, so I guess there is no way to find out.