Hi John,
DON'T SKIP IT YET !!!
I maybe able to shed some light on this lap steel (someone correct me if I'm wrong

).
What you appear to have is a 'modified' Selmer Trutone Universal 8 - 1948/49. Everything is there to suggest this,
the 'modification' is the body, rounded off & stepped, and no sharp edges, (as per the attached photo). Also check out the machine heads, they were normally fitted with single tuners.
Selmer did not make this particular model with a rounded body. Probably done many years ago for the original owner, and based it on the Esquire model of the early 50's.
Now for the good news, one of these sold in August 2015 for........ £930.35 inc Amp & case, in original ex. condition

and another, in March 2016, without case and amp. etc. in average condition for £220.
Question ??? is there a serial number?
Hope that gives you some idea as to pricing, I could suggest somewhere around the £200 mark ! (with a new set of strings & a good clean.

)
ZB Custom S10 3+4, DD3 Digi delay, ZB vol. pedal. Peavey Nashville 400