It's either a 5 lepta (KM#62) or a 10 lepta (KM#63), minted in Paris, with those privy marks on each side of the date instead of an "A" mint mark. It was a 1-year nickle issue, with 25,053,000 of the 5 lepta and 28,973,000 of the 10 lepta pieces. According to Krause they were the only two Greek coins minted in the 20th Century prior to 1922. $7.50 XF, $40 Unc and $100 BU are the catalog values for both coins. If you had shown the reverse, the combination of the owl on amorpha design and the large denomination figure would have simplified the hunt tremendously, as the design would be unmistakeably Greek and the denomination would have focused the search. The 10 lepta is 22mm wide, but since Krause doesn't show a picture of the 5 lepta, I have no idea what it's width would be - other than presumably being smaller. I guess I took too long looking it up. To me it definitely looks like a nickle coin, not an aluminum one. That's why I asumed it was either the 5 or 10 lepta, and didn't mention the 20 lepta, which is aluminum, also 2mm, and has Athena standing at the left and an olive brach at the right on the reverse. Also minted in Paris without an "A", Krause values it at $8.50 XF, $55 Unc and $100 BU.
Sorry, but it's a 20 lepta. The 5 and 10 lepta (km 62 and 63) have a crown instead of a shield. and the 20 lepta D68
Dutch68 is correct as this coin has the shield and crown design and not just a crown as the 5 and 10 lepta coins do.
My Krause does show a very clear picture of a 5 lepta. page 930, 2005 (32nd) edition. It is 19 mm wide And 20 lepta is according to the same Krause as you mentioned made from nickel. D68
The ruler of Greece in 1912 was King George I (reigned 1863-1913).In Greek,Kingdom of Greece is rendered as 'Basileon Tis Ellados',which is literally translated as 'Kingdom of the Hellenes'.A coin inscribed 'Elliniki Dimokratia' is a coin of the Greek Republic. Aidan.