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MikeSGC will encase them backward for you... at least they did for these:
http://www.cardtarget.com/cgi-bin/t206.cgi
They were in a Huggins and Scott auction last year as a set of 36 backs (missing the "big 4"... Cobb/Cobb and the three Old Mill overprints). I've scanned them to our website... and for those doubters the Lenox brown is clearly brown. =)