I though the rounded version was used in the raid; the picture looks as if it is.
The Museum has the flat front version. I think the flat front came out later.

The real issue with these are the perspex was a bit fragile, and they are "zero to the individual" needy.

The night versions has some luminox in them as found on watch hands. It needs "charging up" with light to really glow.
Modern ones are better.