I'm not sure how to tell the year on the Jws or the Tus. Is there any way that you've found?
I am sorry, I do not know of any way of finding the manufacturing year.
Theoretically, Navy Arms may know in what year it was imported,
but it's a very long shot.
I do not want to guess wrong,
but because yours does not have the side rail,
it
might be an early model,
but it's only a gut feeling, not based on anything.
You will find a lot of BS on internet,
including KKW's/TU's being imported in US as early as mid 60's
but remember US and China did not have economical relations
between the Korean War and 1971.
On a side note, the interesting historical aspect to this rifle is that Brno originally made the action for a K-98 trainer by order of the Wehrmacht during the occupation of Czechoslovakia during the second world war. Only prototypes were produced. When the Chinese started to produce this "trainer," they were really just close copies of the original Brno wartime trainer.
I thought all production of Mauser .22's (that includes KKW)
ended at the beginning of the war, 1939.
It served it's purpose, fooling the Allies
(the 22's and sporters were not regulated by Versailles).
Czechoslovakia produced parts for real Mausers (8x57) during the war.
Brno #1 came AFTER the war, 1945 or so
and it was not intended to be a trainer, but a sporter.
Yes, I do believe the Brno #1 action
was inspired from KKW and predecessors,
but I am one of the very few that believes that.
http://www.canadiangunnutz.com/forum/showthread.php?p=1855064#post1855064
To my knowledge, the Czechs did not produced trainers,
at any time, before, during or after the war.
They did produced full size copies since 1920's, though.
http://www.canadiangunnutz.com/forum/showthread.php?p=1860015#post1860015