johnw ~
I was interested in your "Gluck" bottle, but unfortunately was not able to find anything directly related to the name. But no doubt dargofa's 1911 snippet is one and the same. I suspect the correct spelling is Emil and not Emile. But why the bottle itself is embossed with the latter, I can't say. Both Emil and Gluck appear to be of German origin.
It was not uncommon for various types of stores, including pharmacies - general mercantile and fountains to bottle their own brands of beverages. A good example of this is Coca Cola that started out as a fountain syrup at Jacob's Pharmacy in Atlanta, Georgia in 1886.
Regarding the date of your bottle, 1911 sounds about right. But it could very easily be just slightly before or after that. The following is pretty much everything I know about that particular type of "Liquor" bottle ...
~ * ~
"Strap Sided" union oval flasks embossed with WARRANTED, FULL MEASURE, GUARANTEED, or similar affirmative notations - often with the contents capacity (FULL PINT) embossed elsewhere on the body- are a very common flask made primarily from the mid to late 1890s until at least 1920. These "full measure" bottles had a specific capacity that was affirmed to the potential customer by the embossing and appear to be a reaction to the very common "scant" sizes which held less capacity than the named size would indicate.
The Finish/Closure/Lip is typically referred to as a "Double Ring" and was used during the same time period as that referred to above, and was popular for at least 60-70 years. It would have used a cork for sealing.
Lastly ...
I found the similar looking whiskey flask pictured below, which is from "approximately" the same time period, but instead of Emil Gluck, it is embossed with Charles Gluck. Note the name and address ...
Charles Gluck
401 Washington Ave. South
Minneapolis, Minnesota
I have no idea if Emil and Charles were related, other than to say I find it odd that two whiskey flask would have the same last name on them, and be from about the same time period. (It's possible the name "Gluck" was more common than we may think).
I hope some of this helps, and will report back if/when I find anything more definite.
SBB