This image, to me, has that old-timey look of a postcard-format picture. The postcard format was an early roll format with post-card sized negatives. The photo lab would then print the negatives directly onto postcard paper with a contact print. Most postcard format cameras had simple lenses but the results were fine given that there was no enlargement needed.
Amazingly, not only did this image look like it came from a post card, but if you turn the image over, there's an old hand-written postcard on the back!
As for how I did it, I used three texture layers with different transparencies and blending modes over the image (which I edited in raw to be black and white, high-contrast, and overly sharp) to create the worn-print look. Then I found an 1800s postcard with canceled stamp scan and used that as the postcard. I copied the aged-look layers and reversed them (horizontally) and reduced the transparency to give a mirror image to the wear pattern on the back. I did the same with the image -- reversing it horizontally -- so that a hint of the image showing through the paper (as was the case with the old postcard prints if they were held up to the light) is visible. Then I used an online handwriting script generator to create the text. I had to print screen it and remove all the white background and then resize it to be the same size based on location in the note. For the address, I grabbed an address of an 1800s postcard (addressed back then had different required information and address formatting), modified it slightly, and used that for an authentic feel.