5 1/2" tall cylinder clear, only marking "2" on bottom info?

[J.dittmar]

I found this bottle buried next to multiple 1930-50s glass bottles. Only marking to be found is "2" on the bottom. Does anyone have information on this? Thanks

 

[coreya]

looks like an old alka-seltzer bottle.

 

[botlguy]

Yea, those wafer type. Could possibly be for cocktail onions, or maraschino cherries or some such but I'd bet on Alka-Seltzer. The number is simply a mold number I suspect. Jim