Looks like I was wrong in my last post. The same seller did in fact post another Lum for sale before the end of 2013. And it's a real beaut.
An asymmetrical Stag Deluxe Boot Knife. Beautiful double hollow ground with LUM stamp, and includes a sole authorship sheath. Date of origin around the same time as the Sgian Dubh.
Good luck to all the bidders.