To echo aoisson, there is much higher interest in exact payment of rates, solo frankings, first/last day of rate, and fully readable cancels. Here are few that I had handy...
Hamburg to Detroit, July 12, 1923. Correct franking of 480 Marks for period of July 1-31, 1923. Note message includes "Prices are going up rapidly."

Munchen to Berkeley, CA, July 19, 1923. Same 480 Mark rate period but overpaid by 20 Marks with a solo use.

Hamburg to Czechoslovakia, Aug 1, 1923. First day of rate of 1400 Marks for cards to Hungary & Czechoslovakia, lasting Aug 1-23, 1923.

Effelder to Cleveland, OH, Aug 23, 1923. Last day of Aug 1-23, 1923 rate of 1800 Marks for more distant international cards. Convenience overpayment of 200 Marks, but better than waiting 1 day when the rate became 36,000 Marks. Note the message includes: "Prices have gone beyond all limits. We figure exclusively with millions. Working people in cities are suffering from hunger."
