Yep QSO's from the 90's. I just went through a buro envelope, and found these.
A SWL report for my QSO with E44DX on 40M.
QSL from 7O1A on 40M
Then a QSL from E44DX !
No post mark on the envelope.
73 Tony N5UD
Nice collection, Tony.
You were lucky it wasn't stuffed full of JA QSLs. Even though I work all the DX I can find, seem like almost every envelope I get for my call is usually over half full of JAs, many I have already QSLed to before and sometimes QSLs for times I worked the same station more than once like contests. From the way the JA send out buro cards, I would hate to buy the average JA stations yearly QSL card supplies. I bet many go through over a couple thousand a year.
I am the "L" sorter for the W6 buro and I see quite a few of what I would refer to as rarer entities pass through my buro activities every year. Many of these are several years old. Makes one stop and wonder when the process was started to get a QSL for that particular QSO