What is the question?
A few hundred to multiple thousands of USD depending on EXACTLY what you have and its condition, accessories, box, papers.
your serial numbers tell you when it was made 11-Nov. 26-26th day 55-of 1955.
probably If the pistol is designed for 9mm Luger, 9mm Para, or 9x19, yes.
The 9mm pistol would have the higher decibel rating.
No
Most likely a 9mm with a suppressor
9mm MKV is not the same as 9mm Luger.
The 9mm Parabellum is longer than the .380 ACP (also called the 9mm Short) They do not interchange.
It is 9mm pistol
Exactly how is the pistol marked? 9mm browning serial number 72C44338
9mm
it is a Model 39-2 9mm pistol