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Description: Round wick burner marked on thumbwheel "GRAY BOSTON" and on top were chimney rests "PATENT NO                               1.533.833 OTHER PATENTS PENDING" tried looking the number up on Google Patents but didn't match.                                Believe this fits a 0 size collar.                            

Measurements: accepts I believe a lip chimney between 1" - 1 1/16"

Condition: appear was originally brass plated which is pretty worn.