You're looking at a 1950's Knight integrated audio amplifier (preamp plus power amplifier.)  It is working (see my check-out below) but is "cosmetically challenged".
I had planned to restore it but have too many tube projects lined up so this has to go!
Check-out: here are the tests I have done:
All tubes tested, the 12AU7 replaced by a NOS tube (was dead.)  Here's the tube line-up, now all test "good+":
2 x 6CZ5 output tubes
1 x 12AU7 phase splitter (new)
1 x EF86 voltage amplifier
1 x ECC83 (12AX7) pre-amp and tone control
1 x EZ81 rectifier
Output transformer (OPT) is good (no shorts or open-circuit windings.)
Power transformer is good, no shorts or open windings.
Selector switch knob not original - see picture.
I powered it up very slowly on a variac with all tubes out except the EZ81, filter caps re-formed OK, no problems seen.  Tubes replaced, re-powered again.  Power draw normal.
I tested this unit with a CD player to inputs AUX, TAPE and TUNER... all have good sound to a loud level.
I did not test PHONO or TAPE HEAD inputs but would expect them to be good.
Based on B+ voltage (437 VDC with 110 VAC input, see photo) and the output tube current draw, I estimate this amplifier gives an easy 12 to 15 watts (no specs to hand but likely available on the Internet.)
This amplifier is an easy restoration for a "tube technician" but needs a metallic paint job.  I would be happy to advise anyone else needing assistance.
Sold "as is", of course, but description is accurate.
There's a modest starting price to cover the value of the tubes and OPT. 
I prefer local pick-up (postal code L3T 3T1 (just north or Toronto, Ontario) but, if necessary, I would pack (well!) and ship in North America at buyer's cost (ignore eBay shipping estimates, email me for cost.)   
Good luck!
Roger
Member Ontario Vintage Radio Association, see http://www.ovra.ca/
Designer, builder and restorer of tube audio gear.