The 2 DM or Reichmark are .1607 oz ASW (average silver weight).
It should be noted that there are also mint marks on German coins. For a 37 the mint mark is either A, D, E, F, J, G, or J. They are worth about $4 US as VF based on 2005 prices.
The 38 can have a mint mark of A, B, D, E, F, G, or J. and are worth about the same.
Hope that helps.