So if those players were all in the Senators organization then it had to be one of the Stewarts i listed above.
You should send it off to Bill Henderson. He does professional restoration and authentication on jerseys. He would be able to tell you if it had a number change and what it was before. As well as restore the W or Washington on the front of the jersey.
https://thedream.shop/get-started/
Bill does amazing work.
Andy