Great!! First Knick I've seen with a half-pistol grip.
My No. 4E NID 20-gauge is the only NID I've seen with the half-pistol grip --
457534 04 NID Grade 4E 20-gauge Overview.jpg
The 1925 Ithaca Gun Co. catalog states "Full pistol or straight grip."
No. 5E Knick 1925 catalog.jpg
The 1926 Ithaca Gun Co. catalog states "Full pistol grip unless straight ordered."
The 1932 Ithaca Gun Co. catalog states "Full pistol grip unless otherwise ordered."