Ok, so these are not quite vintage postcards, but I thought I'd share some interesting vintage Carte de Visite (CDV) that I came across recently.
Initially I thought these were Cabinet Cards, but after subsequent investigation I found these to be different. Although both comprising of photographs mounted on card, it would seem that CDV's are typically 2 1/2 x 4 inches, whereas cabinet cards are 4 x 6 inches.
What's fascinating about these is the sheer number of photographers that seem to have existed around the late 19th century, often on the same road presumably competing for business.
I've added some others a Flickr CDV set.
Recyling an Old Book for a Paper Journal
11 hours ago