OK...this might give you an idea.
Have a print titled "Day of the fighters" it's five 190s'
over Holland after intercepting B17s from the Schweinfurt Raid.
They are forming low over Canals, with a downed B17 that
ditched into a canal. There are houses, barges and boats
in the print. The print is quite beautiful.
It is autographed by Addi Glunz and A.Grislawski, another
autograph I can't quite decipher.
Glunz and Grislawski were 190 aces.
Considering what's on my print with the terrain etc. I paid
350 dollars for it about 4 years ago..cost me 300 to have it framed properly.
Print is done by Nicolas Trudgeon...one of top 3 artists in that venue. So...the above might give you somewhat of an idea
on what yours might be worth.