Are all Winchester M21 buttpads marked "Winchester"?
 

Looking at a M21 Duck with a red rubber buttpad that is unmarked. Were all originals marked "Winchester"?

Winchester offered various pads if you wanted a non Winchester one. Most had the maker's name. Most if not all Duck 21 guns I have seen have a short LOP and a solid red Winchester marked pad. If you can post a picture of the pad.?

Page 127 of Schwing's M21 book lists 10 pads shown in the 1934 Catalog, and continued to use non-Winchester throughout the remainder of production. Some were marked "Winchester", some were not

Thanks for the info guys. I did find the reference in Schwing's book that a few pads were unmarked.