Help on Strawberry Tray Unknown Mark

[antiquenana]

Please help, I have searched three web sites including this one for this mark to no avail. The tray/bowl is 10.75" from tip to stem, 8.75" leaf tip to leaf tip and 1.50" high. It has three small ball feet on the bottom side. Marked on the bottom side with "-W-" and the word, "Sterling". Thank you for any or all help.