This is a custom made 1-15 speaker cabinet.  It is loaded with an 8 ohm 15 inch USA made (maybe Pyle) speaker.  Not an exact match, but was built to work well with a vintage Fender Bassman tube amp head.  The 3-10 cab I had is sold.  Measures about 26 x 22 x 10 inches.  The last picture might help give it some scale. 

I'm cleaning out the basement.  I have a half dozen loaded speaker cabinets for sale (really cheap) if you need a guitar cab, pa monitor or bass cab.  Look at my other listings.  I would also consider trading speakers for guitar related items... working or not.  If you have an old guitar or tube amp, I would be interested in it.