Neither one of them have eye ridges. I suspect that the one on the right fits in to the eye ridge era, though. I'm sure the one on the left is an older stamp, but I'm not sure of the dates that the unbroken line that crosses the T's was used.got any eye ridges?
I have one other head with a known date, an old Flint Edge double bit that a now deceased friend gave me back in the 80's, it was issued to him when he joined the CCC'S in 1937. It also has the unbroken line. But, I also have a head that dates older than '37 that has a broken line stamp also. I'm wondering if different manufacturers had different stamps?