Thank you, Rooko!
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Thank you, Rooko!
The best online catalog I have found online for US STAMPS:
https://stampsmarter.org/
https://www.theswedishtiger.com/
The first one has A lot of information for world stamps. The second one is a quick ref I use to ID US stamps.
May be good for US stamps, but I picked up a few disagreements with European catalogues, so it is a go-to for anything US only.