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pdlouche
Nope that's just you're typical RWC sports watch hour hand.
Nothing major behind the symbol accept for the fact that there is a large surface area of superlum and if the "Merc" symbol was absent from the hour hand the lum could easily fall out if the case or crown took a large enough impact.
Also the old school fixing agent deteriorated after time so as hands aged the overall stability would decrease anyway.
I used to see this problem frequently on old Tudor Sub "snowflake" hands. It can be corrected by application of a fixing lacquer to the underside of the hands during a service though before it's too late.