In WW2 they started making them out of synthetic materials like bakelite and clear plastic in order to conserve brass. The same pattern of oil bottle (although by this time they were the synthetic materials) were issued for the FN and the Inglis hipower. They are still in CF inventory today, but doubtful you would find any brass ones.
There are a myriad of maker's marks, and as such, you will have collectors of just the oil bottles. These days, it is not uncommon to see prices of $25 and up for them.
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