WW2 Air Ministry binoculars - 6E/293 & 6E/471

[nutting]

WW2 Air Ministry binoculars generally come marked AM and either 6E/293 or 6E/471. I had assumed that those marked 471 were a later development of those marked 293, but I have seen those marked 293 with a date of 1944 and those marked 471 with a date of 1942. Does anyone know the difference between the two?

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[Surpmil]

Terry Vacani if he's still with us, would the one to ask.