help identifying hallmark RD within two wings

[buffed_silver]

Hello:
I have a small creamer marked McAuliffe & Hadley Sterling RD(within a pair of outstretched wings) 421. I have found some reference to McAuliffe & Hadley on the net and I think it is Boston Co., most likely a retailer. I have searched to no avail for the RD hallmark. Can anyone help? I am assuming that this is American and most likely dates to the first quarter of the 1900s.
http://m1.freeshare.us/view/?147fs367556.jpg
http://m1.freeshare.us/view/?147fs367737.jpg

[2209patrick]

That is one of the marks used by the Richard Dimes Company, South Boston, Massachusetts.
In business from 1908 to 1955.



Pat.