The crest is probably that of Bugge.
This massive and extremely rare dish cross is far more unusual than the typical X-form dish cross with central spirit burner used to keep food warm at the Georgian table or sideboard. Schruder's ingenious design features three legs slotted to engage with a geared column within the heater base, so that as one leg extends or retracts, the others shift simultaneously while the three spirit burners distribute heat more effectively than the usual single burner.
The only other known examples of this extremely rare form of dish cross include one with alternating wick burners by Paul Crespin (1738) in the Egremont Collection at Petworth House, Sussex, and another by John Swift (1754) sold from the collection of Mrs. C.J. Devine, Christie's, New York, October 15, 1985, lot 1199, now in a private collection.