I get that and found a 77 catalog with the same bike listed and it clearly states Raleigh 20-30 steel. But the serial # is WL 6086 on the BB. Here's the information I found on Sheldon Brown's website about their serial # 's, but I agree it makes no sense to build a mixte from 531 or hang those components on it. At any rate, it's a nice ride and will make a great city bike!

"In 1974, an entirely different numbering system was introduced for the higher end (531 and subsequently 753) Raleighs. Serial numbers should begin with a "W", which stands for Worksop, the facility that produced theses frames. This is followed by another alphabet. This alphabet indicates the fortnight in which the frame was built (i.e. A = 1st fortnight, B = 2nd, etc.). The third character is always a numeral. It indicates the year of manufacture, the decade being assumed (i.e. "4" could be '74 or '84; it is up to the interpretor to know enough to tell if the frame is from the 70's or 80's). What then follows is a series of numbers. At this point, these appear to be some sort of sequence, but this has not been substantiated. "

Any ideas?