Yes, that is what I am talking about. That flan started as perfectly square, the force of the strike bulged out the sides from the metal flow. Its more severe the thicker the flan. Luckily yours is a thinner coin, so it was not as severe. I just wanted to share that in case people wondered why ancients made "weird" shaped coins. They were trying to make a square one, but the technology at the time was not allowing it.
We have been known to make some weird shaped modern coins also. Sorry for the crummy photo. The coin is actually bright silver in color.
ichibu gin is surrounded by 20 stylized cherry blossoms. Look closely. One cherry blossom on each side will be upside down. This is done so the quality control inspectors can identify which sand cast was used to make the coin. If the flaw is in the sand cast, then the sand cast would be destroyed.
Here is a modern square-baby (man, I love this "3" dollar owl coin) Here is an ancient square-baby (India, Pushkalavati => 185-160 B.C.) Ummm, and here is an ancient cast-coin ... yah, it's a triangle, not a square, but I figured that it kinda fit-in with the rest of these eamples, eh?!! Selinos, cast AE Onkia => 450-440 B.C. (amongst the first bronze coins)
Here are some other square coins I am planning to have as soon as possible. Bangladeş km 10 1977-1981 10 poisha fao Bhutan km 37 1974-1975 5 chetrums Surinam km 12.1b 5 cent 2004 1 lol Strait settlemnts 1/2 cebt 1932 km37 Sri lanka km 149 1987 10 rupees unc Sri lanka km 139 5 cent 3,3 gr nikel-brass 1974 Sri lanka km 139a 5 cent 1 gr Aluminum 1978-1988-1991 CURACAO KM40 5 CENTS 1943 4,5 GR CU-Nİ India 1/2 anna 1940-1946 India 2 anna 1923-1946 India 1 paisa 1965 km 10.1 India 5 paisa 1964 km 17 Iraq 500 fils km 165 1982 Jersey 1 pound km51 1981 Myanmar 10 pyas km40 1966 Myanmar km27 2 pyas Myanmar 2 pe 1949 km29 Muscat and uman km27 20 baisa 1365