Dating back to the early 1900's, another interesting vintage postcard subcategory I've come across is panel greeting cards. These are considerably thicker and heavier than normal postcards of the time, although postage prices remained at 1/2d inland. The only ones I've tracked down so far are artist drawn, albeit uncredited, and published by C.W.Faulkner. The majority are general, watercolour scenes with the occasional one actually credited to a specific place. In general they have some sort of greeting message pre-printed, and slightly indented, on the back of the card, most commonly Christmas wishes or New Year greetings.
Loads of vintage postcards for sale on my web site.
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