The Long Range was first advertised in 1923, but the Hunter Arms records show that one was made in 1921 and an Eagle Grade Long Range in 1922. Only 14 were made in 1923. Total production of Long Range shotguns (1921-41) was 2,606, and of Wild Fowl 98 (1940-42).
This 1923 ad in "Hunter-Trader-Trapper" introduced the Long Range Wild Fowl
In 1924 the ads were mostly just "Long Range"
More information here
http://www.picturetrail.com/sfx/album/view/17318961
and
Spring 2013 "Double Gun Journal" Volume 24, Issue 1, p. 137.