Thanks for your thoughts WT1. I'm reshowing the stamp, this time with measurements, so hopefully this will aid in getting a definite ID.
Your last sentence weighs heavy with my thoughts about the catalog. I agree that there seems to be too many variations being grouped as one catagory, only to be footnoted with numbers to justify it's existence within the group. If my example does not fit into any group, will it 1) be footnoted to fit, 2) listed into a group not in the cataglog or 3) assigned a new "L" number and listed at the end of the listing?
Sure, it's easy to be a backseat driver to someone's time and effort of putting out IMHO a great guide - believe me I've done one on one of my other hobbies and it's no easy task! Like all guidebooks, it's only as complete as what it currently known.
As long as I question what I can't find or not sure where a precancel fits, you will see it here!
Frankie