Not 1930's. VL&D had been absorbed by Abercrombie & Fitch by that time. Also, a 30's gun would carry a Belgian date code. That gun does not. 1924 or later, the gun would have gauge and chamber length in MM--20-65 in the case of that gun--marked on the flats. Yours, lacking that mark and the date code, is pre-1922. As noted above, Bob Beach at Griffin & Howe can almost certainly provide you with information. G&H has the old VL&D/Abercrombie records.

Nice gun. Good luck!