Welcome It's a bit after my time but doesn't look very Dyna Tech to me, I thought they were all bonded frames and that looks like a traditional lugged/brazed frame to me. Perhaps more pics would help.
Ah, thanks maca, couldn't put my finger on what was bugging me about the rear triangle aside from the chrome, Raleigh stays would have joined at the seat bolt not under...?
If it is an ex-team frame then it's quite possibly built by the rider's favourite builder and then painted to look like a real dynatech. I can't imagine anyone would get a steel frame repainted as a dynatech team replica, complete with decals, for any other reason?