The PHILCO Phorum

i looked at a grebe at antiques shop no model number only a ser # looks like e13012 it hums but know signal, wood in very good condition she wants 70.00 for radio i have never heard of grebe other the google any help would be great
oh and are they worth more or less then say a rca or other top sets of the 1930's
john

Here's some basic info on the company:
http://www.radiomuseum.org/dsp_herstelle...ny_id=2528

Grebe sets were expensive and not many were sold after 1929.