Vladivostok 125th Anniversary Coin

I am new to this field and have no idea how to appropriately grade a coin. My best guess is VG. I acquired the coin in a trade I made when my Navy ship visited Vladivostok in 1995/96. I traded some pre-WW2 ship cancelled covers for it and have been using it as a paperweight ever since. Many comments from my friends prompted me to try to find more information on the coin. Any information as to the history of the coin, how many were minted and distributed, the quality of the coin, and current valuation would be appreciated. Thanks. Dr. Marsh.

here is a general description
https://en.numista.com/catalogue/pieces58173.html
to be clear, it is not a coin, which is a piece of money with a face value, it is a medal.

I was unable to find another one on the internet, besides the one on the Numista page.
Without comparable sales, it is impossible to give it a value.

here are some Russian auction sites you might find useful.
I searched for " Владивосток 125 лет медаль "
meshok.net
farpost.ru

Thank you for expending your time and effort on providing this most helpful information for me. Your help is most gratefully appreciated.