Monogram Whiskey...antique bottle...?

We found an old bottle of whiskey behind the walls in our basement, our house was built in 1923 so the basement isn't made of concrete, just layered rock...the bottle was behind the wall up above the rock layers under the house. Anyway, it has a cork in it and most of the label..however it's very worn. We were able to make out "Monogram" as the brand, and High Grade Whiskey on the bottom. It's a brown square shaped bottle. After doing some research on the internet I was unable to find ANYTHING about it. I was hoping someone on here might be able to offer some info??? Thanks in advance.