Epact Scientific Instruments of Medieval and Renaissance Europe

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 'WS'
'WS' (or possibly 'SM') is only known as the maker of a polyhedral sundial dated 1553, bearing Simon Schmidthofer the Younger's signature of ownership and the year 1577.

For instruments by 'WS', see:
   Polyhedral Dial, Signed 'WS', German, Dated 1553 (London, BM)

References:

E. Zinner, Deutsche und Niederl?ndische astronomische Instrumente des 11. bis 18. Jahrhunderts (2nd ed., Munich, 1967), p. 434.