Imperial German Uniforms ?

[JP rikusen]

Hello all,
I purchased this jacket from in Moscow collector than 15 years ago.
He said that it museum controlled goods.
Please help.
I do not understand it.
Country,Rank,category,date And market Price.
Thank you.
jp rikusen
Osamu Inoue

[leibregiment]

Its a Prussian Kurassier garde koller