The oil bottle or "oiler"
Those exist in many forms, from pewter, brass or glass. I like the glass ones. Those are quite expensive, both authentic and reproduction and often to large for such small case. Thus that I made
a plan to make something myself.
I looked for a suitable bottle and found that a extra small nail polish bottle comes close. I shortened the height by chopping off a piece of the neck. The thread for the plastic cap I took of too. Also I flattened the
bottom, sanded off the name on the bottle and all signs of fabrication. Glass can be filed with diamond (needle) files and smoothed with waterproof sandpaper. Final polishing can be done with a normal polish disk and paste for metal. It will not look as shiny
as brand new glass but it should not, it's 120 years old now!
An glass oil bottle most times have a metal screw cap and on the neck also a metal thread piece. On the inside of the cap there should be a rod that holds some oil and when that rod is
hold against metal some oil will come off and oils that needs to be oiled. I found that 3/8 heating coupling parts provide a good base thread and cap. Of course a small lathe is needed for this.
Those come from ebay and are only cleaned up a little and the tips are grounded to suit the screws in this revolver
Those I already had and are authentic old rounds. More about those here