eBay
For sale Electra X510 Concert Professional guitar made in 1977. Howard Roberts style single cutaway acoustic electric imported from Japan by Saint Louis Music Co.  See the

 

 pictures for color and condition. The truss cover seems to be the wrong one and the previous owner must have drilled an extra hole for the output Jack but did not use (filled with wood putty it seems). There are some cracks in the finish. Electronics could use some cleaning up. Nice guitar for your collection.