Page 619 - Chinese SIlver By Adrien Von Ferscht

S.W. [aka: SHING WO]
Hong Kong
circa 1900-1935

All Shing Wo silver appears to be marked as .85 purity
on all items created solely under the S.W. silver mark.

However - Shing Wo also manufactured silver items
for other retail silversmiths such as Wang Hing; the
selection of flatware below carries the Wang Hing
mark and the S.W. mark.

Images courtesy of Bonhams, UK;

http://chinese-export-silver.com Image Library Archive