Q, Remington did make a single blade spear point barlow such as example RB040 or the RC090. Remington also used exotic materials such as tortoise and genuine ivory or white bone. Examples would be the R3385-S and the R1707 or the R1477. Now it is "possible" they made the barlow in discussion with ivory but I have not located and example of said knife as of yet.
As discussed in another thread, related to the validity of a "Remington" knife made in Germany with a very different tang stamp with "german script lettering" of "Remington" as the tang stamp. I am developing and substantiating a theory.
After researching articles on Remington's cutlery start up in 1919, the history of Boker in Germany and in the U.S. as well as articles written in The American Cutler I believe that it could possibly be that Boker made some of the official and unofficial knives for Remington.
Just as a reminder, Remington officially contracted Boker in 1996 to make some of their "wildlife series" knives. These were produced in the Solingin Germany factory.
A thought to ponder... if these were fake knives produced overseas why don't we see a more saturated market? Such as the boot or leg knives? Still digging and researching for a definitive answer.

Rocky