Hello Everybody!:)
I need a little help to ID a vase that is a total mystery to me..
It is brown opalescent glass decorated with bird on a tree.
The decoration technique is very unusual which seems to be darker brown glass outlined in light blue, fused to the body of the vase.
The rim is polished and the bottom has an acid mark which is letter R inside circles / with sunburst / Pineapple?

It will also be interesting for me to know how is this technique called.
Thanks in advance!
Regards!
Dimi