The grommet is magnetic with a brass/ gold plating ( a form of tin used by German toy manufacturers of the time ) which is then painted field-grey on the exterior and inserted through a zinc washer on the inside of the cap. Such a grommet is certainly possible.
You see them with a matching magnetic washer used often in M34 sidecaps before 1939 and a larger un-plated, plain version used in tropical M40's from the later half of 1942 onwards esp in the KM tropical M42's.
What is unusual about this grommet but again not impossible. Is the mix of parts i.e. magnetic tin sheet grommet with a zinc backing washer and the use of such a combination in a tropical M40 cap dated 1941 ( one predominantly sees the use of all zinc grommets & zinc washers in the 1940/41 time frame ),
Chris
You see them with a matching magnetic washer used often in M34 sidecaps before 1939 and a larger un-plated, plain version used in tropical M40's from the later half of 1942 onwards esp in the KM tropical M42's.
What is unusual about this grommet but again not impossible. Is the mix of parts i.e. magnetic tin sheet grommet with a zinc backing washer and the use of such a combination in a tropical M40 cap dated 1941 ( one predominantly sees the use of all zinc grommets & zinc washers in the 1940/41 time frame ),
Chris
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