If you check Holdsworth sales literature of the 1960s/70s you could pretty much order what paint and panels you liked. So this frame is entirely in keeping with that tradition, whether you like it or not - and I DO like it
! My late father's early 70s Mistral for example had a very old fashioned white panel and black panel on the seat tube, more reminiscent of pre war frames. I've had it restored exactly as it was because he liked it = and for the sake of originality. BTW the Professional was not unique in having wrap over seat stays - the Mistral had them too