wicked good bottle man. dont see too many iron pontils from michigan except the cronks. never seen that particular bottle myself. Dr. cronk was all over the place. Detroit, canada, and a couple other places as well but i cant remember off hand.
Thanks guys, it is a nice one and I can't take a good picture of a bottle to save my life. The white stuff is actually on the inside and there are just 2 small fleabites, one on the lip and one on the side near the base. It does not look to have been buried, the glass is nice and shiny. It's a really crude old bottle and there is what looks like a small rectangular slug plate or repair on the embossing at the front between Mineral Water and Detroit.