The heaviest specimens of these Aeginetan staters or didrachms weigh over 200 grains Troy, but these seem somewhat exceptional. The best numismatic authorities are agreed in setting the normal weight at 196 grains Troy; the drachm consequently weighs 98 grains, and the obol about 16 grains. The origin of this standard has caused much difficulty to metrologists. For it is not the standard of the Babylonian gold shekel of 130 grains, nor of the Babylonian silver shekel of 172 grains, nor again that of the Phoenician silver shekel of 230 grains. Various solutions have been proposed. Brandis[275] regards it as a raised Babylonian silver standard, 172·9 to 196 grains. Mr Head regards it as the reduced Phoenician standard; “The weight standard which the Peloponnesians had received in old times from the Phoenician traders had suffered in the course of about two centuries a very considerable degradation[276].” Others, like Mr Flinders Petrie (Encyclop. Britannica, _Weights and Measures_), regard it as Egyptian in origin. According to Herodotus (II. 178) the Aeginetans were on terms of friendly intercourse with Egypt; furthermore weights of this standard have been found in Egypt. Again, Dr Hultsch (_Metrol._² p. 188) regards it as an independent standard midway between the Babylonian silver standard (172·9 grs.) on the one hand, and the Phoenician silver standard (230 grs.) on the other, the old Aeginetan silver mina being equivalent in value to six light Babylonian shekels of gold (130 × 6 = 780 grs. = 10300 grs. of silver), assuming that in Greece as in Asia Minor gold was to silver as 13·3:1.