A picture of the wood splicing on the underside of the stock would help a bit.

 

Would this rifle have been used in the Winter War or WWII?

Since the barrel was made in 1944 and the rifle was assembled afterwards, the rifle couldn't have used during the Winter War, which ended in March 1940. Also, both the serial number and the archival records suggest this rifle was delivered to the Finnish Defence Forces after the Continuation War ended in September 1944.

 

Beautiful M39.
Welcome to GunBoards from Tennessee.

 

Just to be picky, A Nagant is a revolver.

 

 

Info easily found with google search:

https://www.igun.cz/MosinID/MosinMarks.htm

Finnish markings on Mosin Nagant rifles from 1917

A complete collection of Finnish markings for Mosin Nagant rifles, including factories and users like SAKO, VKT, Tikkakosky, Civil Guard and Army.

collectingmosin.com

https://www.mosinmuseum.com/markings/identificationguide

 

This gun is 1944. Winter war was 1939 to March 1940. Finns were involved again June 1941 again to August 1944.

 

Very nice looking M39. Was also definitely expecting to see a Nagant revolver as well based on the title! 🤣

 

Nice rifle @MILITARYMAN1000 - as noted by those before, likely the only combat it may have seen was the Lapland War based on its date of production and relatively late serial number. Looks like it's in great shape so I doubt it saw much service to be honest.

 

Thanks for all the help I really appreciate it
John