How to tell difference between linen, undivided, and real photo postcards

[@ComicsandBoardgames]

This is actually really interesting and helpful, great vid! I don't think I was even aware of undivided cards prior.

[@p1nesap]

Edit: despite their name, linen postcards are not made from flax! Rather, the textured paper resembles flax fabric, hence the name. I'm learning :)