The Kurt Kaminer site (your second link) does list what he calls the "universalized" 1973-1982+ scheme, with a letter code starting (factory location), second letter for month and then the serial. The down tube contains a decal indicating that the frame or parts thereof are made of "4130' CrMo steel.
The head tube logo and a decal on the seat tube suggest that it's an original England-made frame. I also recall finding another site that decoded the post-1974 serial #'s, but it didn't seem to work for me, and I can't find the URL again » FRAME NUMBER BICYCLE DATING GUIDE The Online Bicycle Museum It's stamped under the BB shell, and there are no other markings. The frame serial # is YF98K00287, which I've triple-checked to ensure I have it right. The rear dropouts are also spaced at 130mm, which if original, suggests that that it was built in the era of 8-speed gearing (although now it's 8/9/10 compatible). The bike operates fine, so I've not had to swap out any parts. Crankset is Shimano FC-1051 (square taper), which I understand to be circa 1989 'Biopace', which may explain why the chainrings were replaced with Campy 52/42. RD is Shimano Sora, no externally visible series # FD is Shimano 105, no externally visible series # Since it was a craigslist find, I don't know the history and the bike has a mix of parts, none of which seem original I use an an older steel Raleigh R-100 as a dedicated trainer bike. This is simply a curiosity that I'd like to answer. Before I start, let me unequivocally state that I'm under no delusions that I have a gem on my hands.
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