[1] You probably don't have a "20's era" Dobro mandolin. Dobro wasn't started until 1929, when the Dopyera brothers left the National Guitar Co. to start a rival firm. The patent for the spider bridge setup was taken out in 1929 as well. So you're probably talking 1930's, not that it makes a huge difference.
[2] Neck reset problems are common on these instruments. The neck blocks are made of a fairly soft wood, often basswood -- though my instrument repair person said mine felt "more like balsa wood."
[3] Re-plating seems more trouble than it's worth. If your concern is the mando's collectible value, any refinishing may reduce that. If you're just considering it as a player's instrument, wear on metal surfaces is pretty irrelevant, as long as the tuners work and the body's structurally sound. Prior posts indicate it's difficult to restore pitted or corroded plating to pristine condition.
Dobro mandolins are neat instruments, with a distinctive sound. But they aren't models of the luthier's art; materials are sometimes a bit dodgy -- wood not properly seasoned, plating rather thin -- and almost all that I've seen have shown wear or aging. In your shoes, I'd get it functional, and not sweat the cosmetics. That's what I've done with mine.
Allen Hopkins
Gibsn: '54 F5 3pt F2 A-N Custm K1 m'cello
Natl Triolian Dobro mando
Victoria b-back Merrill alumnm b-back
H-O mandolinetto
Stradolin Vega banjolin
Sobell'dola Washburn b-back'dola
Eastmn: 615'dola 805 m'cello
Flatiron 3K OM
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