Indeed there is, I didn't notice that on the bottom till you mentioned it, it says...
20 then a circle with a sideways diamond, then 2 & below that is 9203-A
I'll take a photo real quick.
Probably 50 cc ... this type of bottle held injectibile (sp?) liquids, vaccines, innoculations and such.. the metal top had a rubber gasket in the center through which a syringe needle could penetrate to extract some of the contents..