I'm not positive about this, but I think that Pittsburgh Camera Exchange ((412) 422-6372), or Bernie's Photo ((412) 231-1717), also in Pittsburgh, might have bought the remaining stock of Spiratone when they went out of business. You might give them a call.
I called Pittsburgh Camera Exchange and Bernie's Photo. Unfortunately, they did not acquire any Spiratone timers when they bought out the inventory of Spiratone after they went out of business a few years back.
I just found one of these as I was cleaning out my garage. It does not have a manual. I picked it up when a shop went out of businbess about 10 years ago. As far as I can tell it still works. Pay for shipping and it is yours.