I have a 1940’s 20g that I’m looking at keeping original or restoring. Seeking advice on which route to take and if restoring which method would be period correct.

oldtimeangler at gmail

It's your gun and everyone has a opinion. I would keep that gun original. I have some restored guns but they were in such condition that the restoration was the only way to help bring back any value and use. That gun appears to be in good condition with honest wear.

As Eric said, I would leave it in its work clothes. Guns such as yours with the single sighting plane make excellent bird guns. It appears to be a field grade?