Hi James

I found the No 2 to a Beesley No 1 by trawling through the internet via Google and looking at all records of Beesley sidelocks.

In your case you could try searching "william evans" boxlock and see what emerges. Of course there is no guarantee that gun 2098 is the No 1 gun to yours. Often a gun was built to match a gun already well loved. Unless of course Wm Evans have already been able to confirm the No 1 serial number.

Best of luck.

Tim