Hi, welcome to the board!
I think this is one of the vases that was made by the Gistl Glashütte in Germany in the 60s-70s, in various colours attached on clear glass. There were a number of shapes. Apart from brown I've seen them with turquois-green or with dark grey colours attached. For comparison I've attached my own Gistl vase, different shape, same technique, so you can see if yours is similar enough.
Astrid