I've read that the notches are for traveling lock and hence they don't necessarily need to be all the way round. My AT gun has it's original brass data plate riveted to the carriage, which states that it was made by BSA in 1941. It came to me with both hand wheels missing, but I've finally managed to borrow some and get some cast in the same brass/bronze material. The elevation wheel has 3 spokes and only partially notched. But I've seen them in ally with 4 spokes on British guns.
The AT gun that the originals came from has quite a few differences to mine! So either it was built in a different year, or more likely by a different company...... Or both? Ron
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