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Hand spectroscope

W. Watson & Sons, London
Lacquered brass hand spectroscope in its plush-lined case (11 cm x 6 cm); this model is similar to the brass spectroscope signed “John Browning” number 7745 described above.
Signed “D.V. SPECTROSCOPE MODEL 426 | W. Watson & Sons Ltd | London | 10864”

Collection: private collection