Early Victorian Etched and (Many) Hand-colored Calling Cards - Set of 19 blue coat I'm not quite sure though

I'm not quite sure though in what context this would be used

date sometime 1900-1920

"KEEP" circled many times in red

Occasionally I will purchase something online where dimensions are not noted

Early Victorian Etched and (Many) Hand-colored Calling Cards - Set of 19 blue coat I'm not quite sure thoughI just found a small lot of these antique calling, or compliments cards, which I am loving for their finely etched designs, bits of poetry, and for the hand coloring done on many, more carefully in some cases than it others! Here is a whole bunch of them (the first two photos document the whole set included). Fun things to drop as little gifts I think, or to frame up a set together. Each card approx 2 3 4" x 1 3 4", give or take. Stains and spotting