Bulova 1975 Accutron Calendar

I found one of these a while back and missed out. Thankfully, I found another. It's perfect; I love Accutrons, my name is Harrison, and I work with classic cars, many of which GM products with classic Harrison Cooling Products radiators and air conditioning units, the company whose logo is on the dial. Glad I finally tracked another one down.  I can't seem to find any ads from the mid-1970s with an Accutron that looks similar. It seems to be in decent condition overall, and runs well, but the discoloration on the battery connector concerns me a little.