I just acquired these 2 zipper flipper Ballys: Surfers and Rocket III, both circa 1967. The former appears to be fully functional. The Surfers backglass is well-preserved (indeed, it appears to be blemish-free) whereas the Rocket III backglass is shot. Fortunately, Bgresto reproduced Rocket III's backglass (depicted below) last year so I ordered one. These interesting Ted Zale designs ought to clean up well and provide a couple of fun summer projects.
I never know whether a new EM game purchase is more suited for the thread dedicated to newly-acquired games or this EM thread. Needless to say, I decided that our EMers would best appreciate these games, even in their unmolested condition.