I think now that we've seen the overly complicated, vapid, and insipid designs that are the hallmark of the 50SQ series, there's much less chance of confusion. But if you were riffing off the series early on, before the law changed to allow 2009 coins...
-----Burton
50+ year / Life / Emeritus
ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club
Owned by three cats and a wife of 40+ years (joined 1983)
Author: 3rd Edition of the Sample Slabs book,
https://www.sampleslabs.info/