Re: Tenor Resonator ...
I have a moon-and-stars coverplate on my National Dobro resonator mandolin; National and Dobro merged in the late '30's, so that may give you some idea of the instrument's vintage.
There are a bunch of four-string resonator instruments made by National and Dobro. If it has a guitar-shaped body, it's either a tenor guitar or a plectrum guitar. The two were tuned differently -- the tenor guitar CGDA like a tenor banjo or mandola, the plectrum guitar CGBD like a plectrum banjo (which is a 5-string banjo minus the 5th string). You can tell the plectrum guitar because of its longer neck.
If it has a round wooden body it could be a Dobro Tenortrope, made for Cliff "Ukulele Ike" Edwards, which is like a resonator version of a tenor banjo. There are two of them shown in this picture. I've never seen one with the moon-and-stars coverplate, though.
By the way, I assume it has a wooden body because you said "no cracks." If it has a metal body, it's more likely to be made by National (before or after the Dobro merger); a wooden body is more likely to be Dobro (or Regal, which licensed Dobro resonator technology and made many resonator instruments). The question Mandroid asked about "spider vs. biscuit" bridge also divides Dobro (spider) from National (biscuit), as the two companies constructed their resonators differently.
There are also some resonator and quasi-resonator "knock-offs" made in imitation of National and Dobro instruments. Some of them don't actually have resonators, just a coverplate above a regular wooden guitar top! That moon-and-stars coverplate design, however, does suggest either a National or a Dobro instrument. Usually they were labeled by a decal on the headstock, but those decals have a way of coming off over time.
See if you can post a picture or two; so far, sorta guessing in the dark...
Allen Hopkins
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