Something like that I find fascinating,to think someone wrote that forty odd years ago and you're the first person to have seen it since. A while back I did some repairs to the front of my shop,on the reverse of one piece of wood were some measurements with calclations as to the fitting of another piece,all in pencil and at a guess unseen for fifty or sixty years at least. I've put a message under one of the timber parts I replaced,I wonder if it will ever get to be read.
A guy I know used to specialise in selling Ford Escorts,he was well know for winding back (adjusting he called it) speedos. He bought one once and laying on his back to get at the dials he found a notice stuck on the back of the gauge.It said "Oh no,not again".