the mounting bracket for the spurs on it now is a 4 hole spur bracket and are mounted wrong as well.
odds are they used the 2 original holes for the original spurs, then drilled for the other 2 holes needed to mount it flush with the shell.
NEW INFO FOR PIC BELOW...
ahh...that just sucks. there's extra holes over the original holes PLUS the 2 holes drilled for the mount. the original spurs only had 2 screw holes plus the hole for the spur to go thru the shell.
if you look closely on the inside, there's a outline of the interior metal plate that comes with the 1/2 spurs it originally had on it. i'm all out of brackets but i have new spurs. however blair might have a vintage set if you wanna go that route which would be nice.
so far it doesn't look like you would have to put in alot of money to clean it up and selling it. i'd say its worth the time to get original parts. guess it depends on how much you have in it.