Thanks guys. Very interesting about 70 mm proofed Darnes marked as 65. It seems that except for post 1965 Dsrnes every time I've asked the seller of a 70 mm French double about the proofs its turned out to have been marked 65. I've always assumed that the chambers had been lengthened Stateside by who knows who. Ted's info suggests that's not always the case. I agree there's no indication of a reproof and speculating about how the double marks came about is pointless. I appreciate the information and insights.
Bill