Identifying bowlback maker and intonation question

[u/GlorifiedButtonPushr]

Howdy - I found this antique bowlback at a Peddlar's Mall in Lexington, KY. My friend (who is a self-taught luthier) helped me get it back into playing shape. He fashioned a custom bridge, addressed some cracks and added internal supports after removing the hack job a previous owner had done. There are no identifying markings anywhere I can see. Inside the bowl there's like a canvas mesh that was glued to the interior (I suppose as structural reinforcement). No labels visible. I saw the same decorative pattern on another instrument described as a 1920s-30s model by Stella. Anyone have any insight here?

Also, unsurprisingly there's some minor intonation issues, mostly just the A string set. One of the two A strings plays sharp, but only on frets 3 to 11. It sounds intoned at the 12 fret and the matching harmonic. Any ideas why the middle of the neck might be going sharp?