The 1970's craftsman name that eludes you is Thit Thong Ratanakorn.
I personally feel that the sword you suspect is 19th century silver dress is more likely of the period of the Thit Thong Ratanakorn sword.
Of the Thit Thong Ratanakorn swords, I must have seen 30+ of the type now...I've even seen them in sets of three with sizes relating to the Katana, Waka and Tanto...all the same style with ivory hilts.
The segmented scabbard types are certainly uncommon as a whole, but also rather common when they all start getting documented. You did well to pick through my unorganised sold stock link...you'll see another 3 fine examples in my latest swap forum post, a fellow collector that I've been put in touch with also has two similar, here is another rare short example from these pages; http://www.vikingsword.com/vb/showp...206&postcount=1
There is the Vittorio Emanuele the 2nd gem encrusted Burmese dah with segmented scabbard, non repousse but gem encrusted at the joins, a sword akin to those pictured in the hands of the body guards of Shan Princes in this article here; http://www.vam.ac.uk/blog/research-...ina-and-the-tai
Other Burmese types have passed through my hands and numerous others seen online over the years..
Comparatively, I know of the Thit Thong Ratanakorn which are often flogged off as 19th century are auctions and dealers...so I guess, when you include this Laos revival of the 70's, it is more a 50/50 spread and not all that uncommon on either side of the border.
There is a non repousse silver three segment scabbard in a well know Thai Silverware book.
I personally feel that these Laos swords were inspired by the Burmese repousse dah of the Raj and later independent Burma.