1966 AD., Germany, Federal Republic, 250th anniversary of the death of Gottfried Wilhelm Leibniz commemorative, Munich mint, 5 Deutsche Mark, KM 119.

Germany, Federal Republic, 250th anniversary of the death of Gottfried Wilhelm Leibniz commemorative, engravers: Ursula and Claus Homfeld, Munich mint ("D"), dated 1966 AD., issued 14.02.1967,
5 Deutsche Mark (29 mm / 11,13 g), 0,625 silver, 11,20 g theor. mint weight, mintage 2.000.000 , axes medal alignment ↑↑, plain, immerged lettered edge,
Obv.: BUNDESREPUBLIK·DEUTSCHLAND· / 19 - 66 / D / 5 DEUTSCHE MARK , issuer, date, value and mint mark around eagle.
Rev.: GOTTFRIED · WILHELM · LEIBNIZ / 1646 - 1716 , his head facing 1/4 right, his dates below.
Edge: plain with immerged inscription "MAGNUM TOTIUS GERMANIAE DECUS" all words separated by a leaf, followed by an arabesque.
KM 119 ; J. 394 .

Year / Mint Mark / Mintage / Details
1966 D 1,940,000
1966 D 60,000 proof

German coins of the Federal Republic are produced at five different mints, coins from each of them can be identified by their mintmarks, A = Berlin, D = Munich, F = Stuttgart, G = Karlsruhe, J = Hamburg.

Gottfried Wilhelm von Leibniz (July 1, 1646 – November 14, 1716) was a German polymath and philosopher.
He occupies a prominent place in the history of mathematics and the history of philosophy. Most scholars believe Leibniz developed calculus independently of Isaac Newton, and Leibniz's notation has been widely used ever since it was published. It was only in the 20th century that his Law of Continuity and Transcendental Law of Homogeneity found mathematical implementation (by means of non-standard analysis). He became one of the most prolific inventors in the field of mechanical calculators. While working on adding automatic multiplication and division to Pascal's calculator, he was the first to describe a pinwheel calculator in 1685 and invented the Leibniz wheel, used in the arithmometer, the first mass-produced mechanical calculator. He also refined the binary number system, which is the foundation of virtually all digital computers.
In philosophy, Leibniz is most noted for his optimism, i.e., his conclusion that our Universe is, in a restricted sense, the best possible one that God could have created, an idea that was often lampooned by others such as Voltaire. Leibniz, along with René Descartes and Baruch Spinoza, was one of the three great 17th century advocates of rationalism. The work of Leibniz anticipated modern logic and analytic philosophy, but his philosophy also looks back to the scholastic tradition, in which conclusions are produced by applying reason of first principles or prior definitions rather than to empirical evidence.
More on http://en.wikipedia.org/wiki/Gottfried_Wilhelm_Leibniz