Derby S P Hand Beaten Silver Plated Cocktail Shaker

Vintage cocktail shaker!
This is a very old item, and has some wear and tear in spots, but in great shape.

The underneath is stamped:

Derby S.P. Co
International S. Co
1903
EPNS
W.M Mounts
Hand Beaten

My item does not have a stopper for the spout, but it otherwise identical to this listing:
https://www.3bcshop.com/derby-s-p-hand-beaten-silver-plated-cocktail-shaker

It''s likely that you could get more of the tarnish off.