You are correct Dave. It was the Y.C. (Young & Cadwallader) pad.
1916 H.S.B, & Co. catalog
H.W. Cadwallader
https://www.trapshooters.com/threads...4#post-9288322
I did find the D-W in the October 1925
Outdoor Life
I haven't been able to find who D & W were