I it was a craft piece or a Hobby shop....why put a mark on the bottom..if it was intended to be a one off....i,ve looked at that mark and magnified it, and there is an A there..along with 2 other letters,..and it has that large wedged bottom....so i,m sticking with
Others were marked with the abbreviation "A.B. Co.". Some jars left the plant with paper labels that have long since disappeared. However you can usually identify American Bisque cookie jars by their unique large wedge shapes on the bottoms.