What is it? An Ink Bottle? Was found at an old demolished (circa 1930s) brick mfg plant.

[EdsFinds]

I'd say bug sprayer bottle, ribbed like poison bottles. " 5 41" on bottom, May of 1941? Just wonderin. Cool find.

Seems a little small for a bug sprayer.

 

[sandchip]

I agree, and a little big for an ink.