The marking itself is most often encountered in an upside-down fashion,which was long considered to be the"correct"way for there RKs to be stamped.However,there are"935 4"crosses with the"normal"upright stamping.Here is anothr axample of how risky it might be to transform a random,trivial occurrence,which the stamping of a frame surely is,into a collector dogma.One runs the risk of slandering a perfetly genuine cross with insignificant rules.