Those are carbon-zinc cells. <snip> Their in-service life is much shorter than alkaline.
I read somewhere that carbon-zinc and alkalines have approximately the same Ah capacity at low drain e.g. a clock that runs for 12 months. At high drain a carbon zinc falls flat on it's face though.
The old Number 6 cells, originally used with magneto phone systems, lasted for years.
In the late 1980s, I remember replacing a pair of them which had been in service since 1959.
Interestingly the ones we replaced them with, which were from a French company, were more "archaic" looking than the Eveready ones we removed.
They looked exactly like a picture in my pre WW2 "Admiralty Handbook", complete with the tar sealant at the top, with a "breather tube" sticking out of it.
The Eveready had a plastic disc sealing the top, & a patent method of pressure relief via the sealing system.