This is a piece of strike through error coin. This error is given to a coin where there is an incuse marking on the coin, that looks as there was something on the coin surface during striking. This might be a wire, metal, even a piece of cloth has been reported being found stuck on the coin surface.
For my specimen here, I have no idea what was the object that form the incuse marking.
Hi, I blog about coins and banknotes. My scope of collection are coins and banknotes from Malaysia, Malaya, Straits Settlements, North Borneo, Sarawak and Malay Sultanates. I also collect error mint coins. I can be contacted via email at firstname.lastname@example.org.