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HankronRobert B is correct. It's rectangular trade card that was trimmed down to highlight Baby Anson. I know that there is a Baby King Kelly card too.
This must have been common practice way back when, as I've seen a variety of Victorian albums with trade cards cut down like this. The person must have liked the die-cuts and decided to make his or her own. This means, that it was likely cut by the original owner 100+ years ago ... The 'Scrapps' cards (ala Sam Thompson) seem to be hot items of late, and likely makes up price-wise for any deficiencies in the Baby Anson.