Nice block of 6 of those $1 Wilson stamps issued in 1938 with very clear Buffalo, Wyoming parcel cancels.
In case you're wondering, the Buffalo, Wyoming post office was built in 1927 in one of the classic designs from that period and the same post office is still in use today!
(I've never visited the State of Wyoming, but I was surprised to see such a post office, as that city has a population of only 4585 people and I would have thought their post office would have been much smaller and more rustic looking given its location.) Gotta love those white lights flanking each side of the building, though, with what looks like claw-like bases.
And here's a bit of trivia: Do you see what's missing from the front of that post office? No flagpole with the USA flag flying and no outside mailbox in front of the building. (Although the picture could be deceiving and not completely showing the full perimeter of the property.)

