The D. O. V. BERLIN mark is listed on page 79, "German Knife and Sword makers 1850-1945" by J. Anthony Carter (2015 edition revised and enlarged by John Walter & Henning Ritter).

See "Armee-und Marinehaus" on page 79 and note: "The D. O. V. mark above BERLIN has been recorded on several good-quality knives."