Andrew... The "BG" backed cards have been in circulation for over 30 years. I did not bring that collection into the hobby, but have seen the notations on cards from the late 10's to early 20's, including Zeenuts, E-120, E-121 and Henry Johnson cards (All cards marketed originally in the Bay Area). Based on what I've seen or owned, it must have contained a few thousand cards. The BG is most likely the initials of the original collector. Often times households which contained siblings that were close in age would result in each sibling writing their names or initials on the backs of the property (cards) to establish ownership.......... There are many other 'personalized' collections out there that you'll likely encounter over time.
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