You mean the A&H stamp is on one side, and the Imperial is on the other side? They looked like two completely different surfaces of anvils, one cleaner, and one more rusty! My mistake. There were several different A&H logos used over their years. Yours is an early version of the stamp. Look for the serial number on the front foot, It will most likely be under the 13,000 serial number range. The other examples you showed are later style A&H logo stamps .