Daiso had both alkaline and traditional carbon-zinc batteries in this size. I chose the latter because it’s for a 1960s device and I think that was the default battery chemistry in the era, plus modern alkaline batteries seem very prone to leaking when left alone for 10 years.
My Canon thermal typewriter TypeStar 220 uses D cells. And I still use that machine… very often. I do remove those cells for long-term storage, though.