Can someone educate me as to the approximate vintage of this sight?

http://www.ebay.com/itm/Original-Lyman-4...=item336c9b762e

Were there Lyman sights available for Mausers in the pre-war period? I don't think I've seen one on a Hoffman or other Mauser action rifle - they usually went with either cocking piece sights or more commonly barrel sights, or am I wrong?