(c) Vin Callcut 2002-2017. Small extracts can be used with acknowledgements to 'Oldcopper.org' website.
Helpful comments are very welcome.
Early mark 1909-1915.
Late mark c1925-1938
Four other marks are included in: ‘More Roycroft Metal’, K McConnell, Schiffer Books 1995, 128pp
Second volume devoted to a brief history of the Roycroft and Avon copperworks together with many examples of products and values.
The middle period mark was similar to the early mark but the tail of the 'R' was straight.
This 'R' in a circle is made up of individual punch marks. It is not from Roycroft but was used by 'Gregorian' copper to indicate that the design was registered. A crisper photo would be welcome.