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MAKER: SPENCER LENS COMPANY

MODEL: 'FIRST CLASS NUMBER 1'

c. 1902

SIGNED:'SPENCER LENS COMPANY, BUFFALO, N.Y.'

SIGNED WITH PATENT DATES: 'PAT. MARCH 14, 1899' and 'PAT. DEC. 11, 1900'

SERIAL NUMBER: '1934'

Spencer Number 1 First Class Microscope