While at the U.S. entry into WW-II the great bulk of Ithaca's inventory of entry-level guns went to the government, but they were still moving high grade guns out to the civilian market --
By the serial numbers on these No. 4Es they had all been in inventory for quite a while.
That ad shown above was a bit wrong as the Western Arms Long Range never reappeared after the war, a few Lefevers in 1946, and a few NIDs in Field Grade and No. 2 through 1948. The first time I visited Creekside Gun Shop in New York, in the early fall of 1986, Terry Turnbull had a big cardboard box full of fully completed 16- and 20-gauge NID Field Grade stocked receivers, but no barrels or forearms for them.
Here is a similar 1943 vintage ad from the Fox Gun Division of Savage Arms Corp.