handy link quite informative

[Flaz]

http://reviews.ebay.com/Old-School-REDLINE-Flight-cranks-a-basic-in-identifying_W0QQugidZ10000000001601730'ssPageName=BUYGD:CAT:-1:LISTINGS:2#item270074184208

[downhill3375]

good info on there mate

[RATTY]

Well done Flaz for spotting that. I emailed the guy who wrote that and asked if it was ok to copy for this site, he has agreed so i will post it up later, perhaps it could be a sticky!