As Steve has stated, I've cataloged 25 different variations.
The HOF had stated there was 11. In the last 5 yrs, I've been scouring ebay for copies.
What's ironic is the fact that I was missing 2 copies for 5 yrs and found both within 3 wks!!
For those not familiar - the difference in the sheet music variations is the photo of the singer on the front.
Plus 2 singers have variations of themselves - e.g. Trixie Friganza - one portrait, one standing.
The 24th was Jack Norworth himself - I did see one a few yrs ago and was signed - it went for more money than I anticipated!
Also, the 1927 version - which I picked up a few yrs ago does have the change in verse characters - Katie Casey/Nelly Kelly - I have never read why he changed them?
This has been one of the more enjoyable areas of my collecting.
mike