Bulova 1968 Accutron Calendar

The date code on the movement says "M8" (1968), but the case date code is earlier (M7 - 1967) and I can't tell if the last digit of the movement model number is a "D" or a zero. 

I've looked through the advertisements for both 1967 and 1968, along with 1970, 1971 and 1972. But I haven't found a match as everything that seems close to this one has luminous dots at each hour and mine doesn't. 

I took the watch to a local jeweler for a new battery a few months ago. Afterwards, though, the watch still didn't work. They suggested that I take it to a place close by that specializes in watches, which I did. He examined the watch and told me that the jeweler put the wrong battery in and ruined the watch. Is that possible? I have the original Bulova battery but not the one that the jeweler put in.