Ingersoll 1C-2374-14-1 TFC503 Groove Mill Staggered Tooth Carbide Inserts 4-1/2″
Item #263 Possibly an Ingersoll, however, not much information available on it. Appears to use grooving inserts offset by its width with 6 total cutters. Combined cut appears to be around 1/2″ at its widest.