It's A Fine Girl WWI Era Red Cross Nurse Real Photo Postcard vintage Lucky Strikes box with a ribbon on one

with a ribbon on one side

I don't know who BL is or was

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They do not stand steadily on their own so would need a stand or something to lean against if not hanging

and I believe dates to the 1950s or so

It's A Fine Girl WWI Era Red Cross Nurse Real Photo Postcard vintage Lucky Strikes box with a ribbon on oneI would assume that this RPPC was made to announce the birth of a baby girl, though the "fine girl" might also describe this pretty and kind looking Red Cross Nurse herself, whose uniform places her in the 1910s or so. Could be a fun one to send as a birth announcement yet, or as a gift to a dear daughter on the anniversary of her arrival in the world! 3 1 2" x 5 1 2", unused back, good antique condition.