Thanks Sam, more pictures and stories about Vietnam era model 14 Randalls will be forthcoming.
Here is photo difference between hilts of 1968 Solingen Model 14 (left), and late 1972-73 model 14 (right). I've seen a couple of "newer" model 14s in older sheaths that are passed off as being 1960s Vietnam era or something...so this is a feature to be aware of.
There are probably some other variations in the general shape of the hilt earlier in the life of the model 14... I just haven't investigated it thoroughly. I've not found this feature commented on before (except by me), but that is not surprising. In my opinion, the collector community should reject unsubstantiated opinions. Even "expert" sources can be very wrong.