"JS" marked Plunger-Type
"2-Compartment"
Pistol Powder Flask

Plain 2-compartment pistol flask, cylindrical in design.

This flask is a plunger-operated charger, unscrew spout; secondary compartment - in bottom of body - is accessed via and knurled cap or bottom knob; plain brass cylindrical body (~3-1/8" x ~1-1/4") with brass top and plunger.
"JS" hallmark - in script - on bottom cap.

If you need further information, please post your questions to me directly via E-mail.