I'm trying to figure out who made these repo's as I've never seen this type of base treatment. The light green concentric ring flask has an impressed I and 1973 along with an etched 45. Its about 7 1/4" high by 6 1/2" across. The Blue Union Co. flask has an impressed I and 1974 along with an etched 160. It's about 7 1/4" high by 4 1/4" wide. Both have a rough sharp pontil area. Any thoughts would be appreciated.