Several lifetime years late to these posts on the whole Ludwig Rivet Era thing, but just wanted to say "Thank You Guys" for the education info on this topic. Seems I owe an apology to a drum seller with a late Vintage 70's (may be 1979 or 1980) Ludwig drum kit for sale that has riveted seams (with complete elongated ripped away wrap seam damage at every rivet on every drum, all barely hanging on). I sent a reply in regards to his ad description of "the seams on this kit are the Ludwig factory riveted era".. lol, I replied to his ad with "Ludwig has never riveted their drums" (that's someone's bad choice repair job).. From everything I've researched indepthly all these lifetimes about Ludwig, can't recall reading anything of this rivet era and someone replying earlier to this post topic even mentioned Ludwig did hide it all very well.. But now, I do remember seeing riveted seamed drums in some of their 80's Product Catalogues, but they were the single headed open tom models with that protective ring around the bottom of the shell, plus in the concert tom models too. Just thought it was only for those types and not actually manufactured with seam rivets used on any double headed drum kit shells.. So glad it's all over with now.. Even really felt the disappointment Ludwig must have endured. I have an early 1970's Vintage Ludwig Classic MACH 5 Series Blue Silk 3 PLY Maple drum kit & just wanna add-on an exact identical same series match kick drum for real true double bass drum feel instead of the single bass double pedal thing, but don't need to pay the full kit sale price, plus tax, plus shipping & handling fees too, just to have that true double bass with someone else's miss matched bass drum, especially manufactured with this riveted crap. The Traditional Blue Silk Wrap needed on my perfect exact match identical series kick drum find I want to buy is no longer available & nowhere to be found around the world.. The lug casings would have to be the long full length Mach Series too. Finding a rewrap project same series shell just seems pointless now.