Does anyone here collect vintage postcards?

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Lately, I have been interested in nice vintage postcards, and I quite recently found out that there are quite some people who collect them. And some postcards are even quite valuable! So I might want to try collecting some, but I hardly know anything about it! So does anyone here on MyLot collect vintage postcards? If so, what do you think I should know about it before I start? And are there any good online resources you can recommend about this topic? Thanks in advance for any replies! :)