Welcome to the forum , BigYin .
I'm with wendy177 .
Yours is a lorgnette .
The eyewire screw appears to be a replacement (a common repair when a screw is stripped or lost) & possibly could be replaced with a better one .
You can take your item to a local eyeglass shop/optician & have it's 'power' checked - usually very quickly & free - on their Lensometer .
If it's 'power' , in diopters , is not a standard power (such as +2.00 , +3.00 etc.) & is instead something with 'fractional diopters' such as +2.25 , +3.50 etc. , you can be certain that the lens was custom-ground for the original owner .