here's an ebay listing for "late '70s game used bengals helmet" with a lou lampson coa - while the shell and riddell facemask are consistent with what the bengals wore during that era, the "bengals" decal is not - it's a knockoff decal currently available on ebay....

http://cgi.ebay.com/CINCINNATI-BENGA...QQcmdZViewItem

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here's a look at a few authentic bengals helmets from that era - notice the decal font, especially the "g"....





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now here's a look at the "game used" begals helmet currently listed on ebay along with a modern riddell proline throwback helmet and a set of ebay decals - again, notice the fonts, especially the "g"...