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@colin2011
The SB prefix was for 'normal' SBDU frames the ones that could be bought by the public.
The actual bikes ridden by the sponsored riders didn't have SB numbers they just had the riders initials, the year and which number bike it was for that year.
A few years later there were a few unusual frames which had both SB numbers and a set of riders initials but that seems to have been a one off in the mid 80's.
If you do decide to sell drop me a PM with the price (though I expect it will be beyond my means).