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... items such as gold and silver charms, watches, utensils, clothing and the like, are usually less desirable than pieces without monograms.
Closer to what we collect; Gambling Chips....
"Monogrammed Chips: Unless a monogram on a chip can be authentically identified with a famous person or famous gambling establishment, monogrammed chips generate little interest among collectors."
From "Antique Gambling Chips" - Revised Edition.
I don't know if this (rersonalized slot cards) holds true with most collectors, but I would rather have a blank card than a personalized card.... and a monogrammed chip over a blank one. 
JB
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