I'll add the info to my entry. Bill Borland said it was a "registered casino design" . Maybe the "N" is for Nintendo. I'll mention it at my listing.
Thanks,
Robt.
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GERARD PHILIPE in "The Gambler" (a/k/a "Le joueur") (1958 ).
http://www.antiquegamblingchips.com/StillsB_OthMaleAcs.htm