Ok, I had a look at the various era Sideswipes I have here and here's what I've come up with: - Japanese Diaclone Sideswipe: 1 verical line for each foot - Italian Diaclone Sideswipe (red): 1 vertical line for each foot - Italian Diaclone POLICE Sideswipe: 3 vertical lines for each foot - US Sideswipe: 1, 2, or 3 vertical lines for each foot - US Red Alert: 2, and 3 vertical lines for each foot - Reissue Clampdown and Deepcover: 3 vertical lines for each foot. I think the Japanese Diaclone POLICE Sideswipe will have 1 vertical line, all reissues have 3 vertical lines. At a guess I think the 2 lined ones are late prerub/early rub on Swipe and Red Alert? Maybe changed about the same time copyrights changed and the launchers for Swipe changed. All the best- Maz