Speaking of Harmony archtops, I see RetroFret just listed a model I have always been curious about, a Patrician:
https://www.retrofret.com/product.as...ic-Guitar-1954
A Harmony Monterey was my introduction to archtops, so I have a soft spot for the brand. Schedule permitting, I will try to check this one out at the weekend.
As more relevant here to the OP, maybe consider contacting RetroFret or one of the other vintage dealers for information and advice about these instruments.