I don't know could be gin or other liquor. I'd love to find out but there is no way to do it wuthout ruining the original sealing. Not so sure about the date either but I believe it's before 1920, before machine made.
That's a neat addition. The form is common as a ceramic, but I don't recall seeing a glass one with handle.You really can't date Euro minis by American ABM dates. All over Europe, They were using blown minis into the 1940s.These are all 1930s/40s era examples. All are blown, all are Dutch.The Bols in amber glass is similar but no handle. The two ceramics are same form as yours.