Two of these were saved new year's day from a line demo along with three others which I know are OB M-4325's. The glaze is a dark burgundy and is rather uniform. In the right light one can faintly make out drip marks. The upper surface on both is somewhat lumpy in the glaze and the whole insulator is rather hefty, I.e. the lower skirt is 5/8 of an inch thick. The glaze rest on top has some shallow stamping, on one "JUN 1" is just legible and the other looks to read "PAID", but suspect it is probably "patd" or the like. I am curious of just how old these are and who made them. The line is (was) dominated by Ohio Brass but there were a few variations sprinkled in. I only found five in one piece that day. These are the lucky ones...as of this writing the majority of their comrades are laying in pieces half buried in snow.