We have searched everywhere and the manufacturer's name is nowhere to be found. The only marking I could find is shown in one of the photos. The table was purchased in 1991/92 and we paid $2000 for it. Would also appreciate estimates of its current value. It was rarely used and is in very good condition, although we're not sure what brown spots are on underside of slate. It appears to be 3-piece slate. Thanks in advance!