Got a lightning jar, can the metal closure be brought back?

[bottles_inc]

Picked this up today for a steal. Not well versed in jars but I'm pretty sure this is an 1880s one. It's in perfect condition except for the metal closure, which has been mouldering in a farmhouses basement for 140 years. Is there any way to bring back metal this far gone? If not, what's the best way to clean it?

Side view

Here's the base

 

[yacorie]

Just take one from another jar - the metal is east to find. That one won’t come back and when you take it off you can also clean the rust off the jar