I've recently purchased a super collection of thousands of old postcards. Most if not all centered around the states of Michigan, Wisconsin, Iowa, Minnesota and Missouri. The cards were carefully cared for all these years, even though not kept in albums or protective postcard sleeves.
The collector must have truly loved their postcards! What is amazing is the sheer number of real photo postcards in the collection! I would guess probably 400-500 of the cards were RP's ! The focus of the collection was small town views, from 1920 until around 1950 or so. Some super images of storefronts, cars, factories, lighthouses, steamboats etc. I'm proud to be offering these in the coming weeks on eBay.
Whats interesting is that I found a handful of cards in the collection that date to the 40s, but were written on and mailed after 1970! They apparently collected them, held onto them for many years, and then pulled them out and mailed them later!