I would suggest you do not put much weight on the Worthpoint "attribution". always remember they are a selling organisation and where once they could be relied upon to vet and ensure a degree of accuracy, they are no longer at all reliable and simply pass through - typically from an Ebay originator. Sorry I can't help specifically. But because it is so simple, and the photos show the hole does not even go down the center of the block (if you look at the side view), I would suggest it could come from almost anywhere including India, Mexico. China, etc. Note also that the Worthpoint shown originates from Ebay - not Worthpoint itself - so we all know how reliable Ebay sellers are at providing accurate attribution.
Ross