Can't say much about it. Cone's book only refered to an example with a red border instead of green, like a party pin. The most "common" maker mark is "RK". I think Mr Jnoble has one with a full written Hungarian manufacturer.
Found a little bit more info about W. Redo. Seems that this manufacturer kept very busy after the war, producing almost every kind of badges. The only differing is the way the marked the badges. The post war badges have a less crispy lettering and the letters are less wide than their pre- war counterparts. You have to compare original Redo markings very closely with the badge to be sure.
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