Doing some research I came across this. Not sure how legit but nice info and story. Came from I think a Gibson or les Paul fan site.
"Has anyone seen any pics of Bob Marley playing the guitar Gibson used as the Marley model? ( Football shaped aluminium surround etc) The reason I ask is that in London (1973 ) I sold him the LP he's most often pictured with , and later added the famous enlarged round cream switch surround. as a temp repair. (The guitar fell off a stand only a week after he'd had it and punched the switch through, he never bothered bringing it back for the top repair it needed, rest is history) Most folks have only ever seen him playing that guitar,and can only wonder why it wasn't used as the "model".
Copyright?: BOBMARLEYMAGAZINE FORUM http://www.bobmarleymagazine.com/forum_bmwm/showthread.php?t=63356
( the guitar I did.. 57 special if I remember, note the big round switch plate and original pickguard))"
As a wee joke we inscribed " riddum and trebull" in pencil on the new switch surround , which got a big laugh out of Bob when he came in to pick the guitar up. Aston Barrett bought a Cherry slot peghead Gibson EB3 same day.
Thanks again for taking the time to reply, I think the mystery is cleared up once and for all."
These are all post by a member on that forum. If you'd like to read the rest go to that site. One of my goals is to own one of the Gibson signatures they made. Only 200 of them are out there. If that many today.