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runscottBob - it sounds like no one's seen an m116 with cross-hairs. If such cards exist, and with blank backs, it would be reasonable (in my opinion) to believe those to be proofs, and the "non cross-hair" versions would be something other than a proof (perhaps scrap or poster cut-out).
The cross-hairs were used to line up colors, but it doesn't seem unreasonable to me that some card issues might not have used cross-hairs for the proofing process.