I never knew of the existence of the Sanquhar Post Office until I got this card from L.W.A. member Sam. The Sanquhar Post Office has been in continual operation since 1712. That's over 300 years! Now, mind you, the post office of three centuries ago was more like a private mail service for the gentry of the region and there were many others like it. It wasn't the first one around, but it is the last one that is still serving postal functions today.
There is so much history to it. There have been whole families literally born in the post office. It reminds me of the Terry Pratchett book, Going Postal (I highly recommend that, by the way). You can read more about this storied office at this BBC link (they also have credit for the photo above). I also would like to point you to a blog transcribing letters of Marion Brown between 1865 and 1903 that went through this Scottish post office to her American relatives. It's all fascinating. Thanks for the postcard, Sam. So much history in one little bit of paper!