I hope everyone is staying healthy. Quick question, am I correct in saying the DA Navy Approved, blue or orange label, was only produced in 1957? I have been digging through the archived catalogs in between pretending to be a kindergarten/preschool teacher and working a new night schedule. I just wanted to make sure I was not missing anything in my very disjointed research. On that same thought, does anybody have a guess why there where two different label colors for a unit that only had a one year production run?