Onondaga Pottery White Porcelain Pitcher. This O.P. Co. pitcher is in very nice condition overall. There is, however, some age-related grazing evident on the inside bottom. (see picture).  This distinctive piece was manufactured in Onondaga  NY, sometime between 1920 to 1966. This particular pitcher is stamped  with the seal of the Herkimer Masons Lodge No. 423 F.&A.M.  The bottom bears the O.P. Co. and Syracuse China stamp on its bottom. It stands 10 inches tall, has a 22 inch circumference and rests upon a slightly base measuring 5 inches by 4.5 inches. It weighs in just a hair under 5 pounds.