This is an extremely rare Oneida Community Ltd. US Mark I Trench Knife that went into production about the time WWI ended and so only a few grips and prototype knives were manufactured. These knives did not have scabbards. The specimen has a 8 inch double-edge blade and the OCL brass grip. Reference is the Adrian Van Dyk Knife List #115, p. 8, # 56 and Cole Book III p. 26, No. 4.