
From a Remington brochure --

In the early 1930s, "The Sportsman" had a three-bird roll-stamping on the sides of the receiver and the name "The Sportsman" was roll-stamped on the side of the receiver, while the Model 11 receiver remained plain.
In the 1937-8 time frame, Remington Arms Co., Inc. revised the roll-stamping to one bird on each side of the receiver and started putting it on the Model 11 receivers as well, and they began roll-stamping Model 11 or "The Sportsman" on the breech-bolt at about this time.

They also dropped the separate serial number sequences for "The Sportsman" and began numbering them right along with the Model 11s. Probably all the result of DuPont cost cutters work at Ilion!!