Great Scott Antiques
Web site: https://www.greatscottantiques.com/
A rare example. sadly with some issues.
Unfortunately it has a dent in one side of the body, which could be removed.
When I purchased it the spring was absent, but I found it in the bottom compartment. It fits well, and works, but is not currently fixed to the flask.
4.75 inches tall.
Priced with condition in mind.