Help with rare Rothschild tray marks

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Greetings )
Can someone please help me identify this Austrian (?) maker - WCH&S.
Based on my research it dates pre 1836 (14 1/2 loth = 0.903 purity)
Much appreciated!
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Manufacturer’s mark WCH&S for Wilhelm Conrad Hesselberg & Sohne, Frankfurt, active 1814-1893.

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