Gold Marc Monticello

So far I've heard these are pretty good heaters. Does anyone have info reguarding BTU, heating capacity or owner's manual on one of these? In fact any info including pics would be helpfull. Gold Marc Monticello, label ser. No 113, date tested 5/8/80, wood and coal. UL 1482. From Arnold Greene Testing Labs, Natick, MA. Clearance to combustibles 20" sides, 20" rear. Thank you in advance for any help!
Chris