I was given this a few years back and I have no clue where it is originally from, and i know nothing about easels besides the fact that this one is VERY special.
I saw some that went for thousands of dollars on google.
Its is the 55" inch tall version of this easel.
From what i can see on google, they call the style "Rococo Style" if I understand correctly.
It is fully made of massive Brass and has 3 stamps indicating some kind of serial number.