TCoCD: Adam Ries

(click for larger image, 49k)	Federal Republic of Germany (28.03.1959) 10 Pf 33 * 27.5 mm Michel 308 The stamp was issued on Ries' 400^th day of death and depicts the casting-out-nines method, a sanity check to ensure that hand computations of sums, differences, and products of integers are correct.
(click for larger image, 48k)	Federal Republic of Germany (07.05.1992) 100 Pf 43 * 26 mm Michel 1612 The stamp was issued on Ries' 500^th birthday and shows the casting-out-nines method again.
	First Day Postmark