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Signature	Maker	Instruments	Comments	Location	References
THON, IO. H.S.	Holland?, 1721, MIM	Sundials, 1721 = D., P.C.(1975).	reproductions in silver or brass, dated 1721 were for sale at the Musée d'Horologie at Chaux-de-Fonds in 1978; Mörzer Bruyns thought the name was Dutch.		Mörzer Bruyns 2; Brieux 1; RSW.
THON, IO. H.S.	Holland?, 1721, MIM	Sundials, 1721 = D., P.C.(1975).	reproductions in silver or brass, dated 1721 were for sale at the Musée d'Horologie at Chaux-de-Fonds in 1978; Mörzer Bruyns thought the name was Dutch.		Mörzer Bruyns 2; Brieux 1; RSW.

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