The Southworth (paper manufacturers since 1839) logo is virtually exactly like this die-cut metal inlay. It just may be a shot-in-the-dark, but the other chips found in the salesman's case where this one came from had three Anheuser Busch die-cuts and three Vernon Country Club die-cut chips....along with one or two other unattributed metal die-cut inlay chips.

Does anyone have any ideas as to attribution?

JB