Vintage Parlor; Help ID

[TheSkyisCrying]

I just bought a parlor guitar that has no markings on it anywhere (I looked inside with dental mirror thoroughly).
How do I determine manufacturer and approximate year of manufacture?
Measurements:
Lower Bout = 11 7/8"
Upper Bout = 8 7/8"
Body Length = 18 1/8"
Body max width = 3 5/8"
Overall Length = 37"
Scale = 24.5"
12 frets clear of body
18 frets total
Fret markers at 5, 7, 10
String width at Bridge = 2 1/8"
String width at Nut = 1 5/8"

Thanks for the help!