[Researcher]

I don't have a 1923 Ithaca catalog, but listings were pretty similar from the time the No. 1 and No. 1 1/2 were combined late 1919/1920.

No. 1, 1919-1920 Pocket Catalog.jpeg

1924 Ithaca catalog --

1924 Catalog, No. 1.jpeg

In the 1925 Ithaca catalog they also offer the option of a selective single trigger as well as --

1925 Catalog No. 1.jpg