Iron Pontil Otto Zwietusch pontiled Albertson patent spring stopper bottle

Otto Zwietusch was an early and long running soda and mineral water bottler in Milwaukee. This is the only known example of any bottle from him that is pontiled. He was in business from 1858 to about 1890. This bottle is also the only known pontiled example of the original Albertson patent gravitational stopper. Could a bottle be more desirable? This bottle has unbelievable gravitas with Wisconsin collectors, stopper collectors and pontil collectors. There are less than a handful of all known varieties of this patent stopper bottle in the nation. There are even fewer whole examples of all of those bottles and again this is the only pontiled example ever discovered!!! Another amazing thing is that this is a different mold than the two whole examples of this bottle that exist! This bottle came from Jon Stiener Jr who got it from Steve Hockhalter. I have no idea where Steve got. Thanks Jon!