As far as I know around 5000 of these cruize visors were produced between
1940/ 41. This one being made by BMB and dated 1941,did BMB make all the 5000?
Cruize visors were the idea of Sir Richard R.Cruize during the first World war to reduce eye injuries.
This type which I think is a Mk3, had limited use with the military as they were found to be unpopular with the troops.
They were then palmed off for use on the home front.
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