You guys were right - the last 2 digits in an IF serial number refer to the bb-st measurement. When I finally got around to registering my bike on the IF owners website, I found an explanation of the codes that make up each serial number in the members only section. My last two numbers are 46, and if yours are 38 and 44, you most definitely win the peewee bike sweepstakes - congratulations! IFjane, I could only access 2 of the 4 images you posted. My bike can be seen now at http://www.ifrider.com/register/crownjewel019.htm (page 20 in the steel CJ section). Cheers, and happy New Year to all!