yes, that's right - rifling inside the tubes at the bottom bracket shell.
now wasn't SL a non rifled tube set? i remember SLX coming out at the time and
the big deal about it was the rifling inside where strength mattered the most
ie at the BB area and also in the base of the fork column.
all the PDM coloured frames that we sold at the time had the little italian
flag on the top tube - i can't remember seeing one without. the Prelude
frame that you mentioned was perhaps a 90s frame as i have no recollection
of it at all, i'm afraid. you mentioned that a few companies made frames
under the concorde badge - i had no idea about this and indeed at the time
remember all kinds of folklore about who really made them!!
what about the fork on her frame - i don't remember seeing that kind of
"unicrown" style on anything of that era, but it's unmistakably a concorde fork.
as far as i remember they all had the typical italian "external sloping" brazed
crown of the cinelli SC (?) style - raleigh also used this style as well as th
"internally sloping" SCA crown as an option on their SBDU frames.
thanks for your extensive reply - you've thrown up a lot of information there.
ps here's shot of the complete bike - the only thing missing are the red look pedals
which are due any day now..
TvT, Oakleys & painkillers . ..
..what else could you possibly need?!!