After listening to Eric's playing of Happy Days and lonely nights I did a search on You tube for examples of the song and came across this version by Ruby Murray.
The video consists of a series of sheet music covers. The second one is Happy Days and I noticed the price of one shilling which I think is worth about 5p in new money. The next cover, "If anyone finds this, I love you" is priced at two shillings but also has a modern price sticker at £4 which is 40 times the original price.
I then had a look on ebay and found the sheet music for The Sound of Silence by Simon and Garfunkel which originally cost 30p now selling for over £10. I am now hunting around the house for old sheet music to make my fortune!
I wouldn't bother - most of it is online these days.
I used to have a stack of old ukulele sheet music, it was in a different key to what is played today, which wouldn't have been much of a problem, but it was just too damned awkward to find anything, in the hundreds of pages it consisted of.
Drifter, I am guilty of buying old sheet music. The cost, I think, is relevant. In the days where a sheet cost a shilling, that shilling would have bought a meal. The internet helps with tabs, but the actual music notation is great to have for the rhythm and for transposing keys. Good luck with making your fortune.