The Belgian initial contract and initial gas seal design patent nagant, as well as the civilian or custom order nagants for officers or public can go for quite a pretty euro, ruble or u.s. or cdn dollar.
especially since they are pre 1899 u.s. and 1898 serial no. for cdn non firearm class in north america.
There were, and still are, many belgian copies a well as how you would term, eastern block copies. Many many Russian industry and private copied their own government and military licenced contract nagants.
M1895 Nagants are quite cheap where I'm from, there's unknown thousands of them, many copies, and who knows where they turn up from or their history or their quality of finish and serviceability varies due to cache and oxidization issues.
It's fairly common for a household in the 'border guard' states and baltics to have a nagant or pps, ppsh from the last decades of peasant army days prior and cached buried during to the marxist bolsheviks and soviet socialist revolution to war times.
The gas seal was, is, a very desirable quality in design, so much as many copies of the action were made in modern revolvers in Russia.
Many were barreled or modified for suppressor for more recent target competition as well of course for many government agencies, as well as 'forest people', and termed guerrilla resistance right up through the mid 1950's in the baltics and border guard states 'Ukraine', moldova, romania, even finland and poland etc.