If you compare the two different round “Dienststempel” service stamps used by paymasters on this page of this original Soldbuch, you will notice that they are two different sizes. The one on the top is neatly contained within the column and measures about 33 mm in diameter. The lower stamp is larger than the column and is about 35 mm. Sizes up to 37 mm are not unusual for these round stamps, they varied in size.