Excellent quality, probably made by battle brand birmingham, copper saucepan. The pan is 23cm in diameter and has 2.5 mm thick copper. As you can see from the photos, the tin is in pretty good shape, although it would benefit from some tlc, i can't see any copper poking through. This is a restaurant quality pan, not a lightweight import. I would say that it is over 4kg, or there abouts.
The lid is a later replacement, and is a touch small for the pan. The pan sits flat and has no signs of repair that i can see. The handle is copper riveted cast brass and is tight, not at all loose.