It has taken a number of years to sort out that the W in a Crown marking found on Colt Official Police, S&W sub machine guns, and Thompson SMGs. Some one found the marking on paperwork at the Pattern Room associating the marking with the inspectorate at Woolwich.

To further the point, the new book, "Great Britainicon -- Tommy Gun Story" by Tom Davis has information on the Crown W marking found on Thompson SMGs. He references the marking being found in the following W O pamphlet:

Armaments Inspection Department , List of Stamps Used in Various Divisions, revised 1/10/39.

Does anyone have a copy or source?
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