I have found an example of RPM#6 which is later than stage L, the last stage listed by CONECA. This new stage has a large die chip out of the 9 of the date, where stage L has no evidence of a chip even beginning to form. This likely means there are intermediate stages after L but before this coin. In addition, this coin shows a change to a new reverse die, so is a new die marriage as well.
See high resolution images of obverse and reverse at EasyZoom website:
Obverse: https://easyzoom.com/image/238740/album/0/4?mode=manage
Reverse: https://easyzoom.com/image/238742/album/0/4?mode=manage
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