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I think that it's rare in the sense that a majority (well over 50%) of old bottles don't have their stopper/cap/sprinkle-pourer
when they come up for sale.

Keep in mind that I'm certainly no...

MJC, I couldn't really say except to guess sometime between 1940-1960.
If you check out this link, you will find the 1926 catalogue for the Illinois Glass Company:
LINK: Illinois Glass Co. 1926...

At 7-1/2" by 3" by 1-5/8", this is a good size for my purposes.
AUD$26.60 is a bit expensive but these are as rare as hen's teeth.
187835