Hi and welcome to the forum.
Everyone would want this to be a real 19th century historical flask because if it were, it would be worth a small fortune. But, alas, it is not.
This is a modern, machine made replica of sorts - perhaps imitation is better since it does not closely adhere to an original mold detail.
These modern bottles are collectible - you will find them selling on ebay but not for much - perhaps $5-$15