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Message:: [QUOTE="-jeffB, post: 1364833, member: 27832"]In my opinion, dateless Buffaloes are fair game for "restoration" -- plopping them into white vinegar, which will often bring out the date over a period of a few days. This "destroys their numismatic value", but that pretty much disappeared with the date anyhow. I do have one concern about this practice, though: I can imagine a couple of expensive techniques that might reveal the date (from density variations) even though it's not visible to the naked eye. If those techniques were to become widespread, you might be able to get an "invisible" key date slabbed, as with the "invisible S" ASEs (where the TPG can unambiguously identify them based on their shipping origin) or the dateless 1916 SLQs (where the TPG can identify other markers on the coin). If that ever happens, well, the acid-restored coins will still be "ruined", but the non-restored ones would presumably have some intermediate value between acid-restored and date-visible. But, realistically, especially for no-mint-mark Buffaloes, there's no value there to impair. Do with them what you want, or sell them on eBay for up to a quarter apiece.[/QUOTE]