Hi, I have just registered for this forum. I have owned two Centruion Professional frames that I bought new in the late 70's in New Zealand. I sucessfully raced them both, even winning a few races and an NZ title on them. One was stolen, and the second I dented in a crash and sold.
I do recall they had a serial number starting with M, due to one being stolen.
Ampala's bike is identical (lugs, even the tapering down on the drilled lugwork from hand finishing) to the ones I owned, apart from the braze-ons; mine had none.
If anyone has a 70's Cinelli Professional 24" (60cm) frame they would sell (no braze-ons) , I would be very keen. It will be restored to original condition and specced with the parts I raced with (Campagnolo and DuraAce) without any expense spared.