I'm reasonably sure I'm accurate with this information.
I recall seeing almost an entire eight foot table covered with boxes of these knives at a knife show in the past, most likely in the 1990's. I'm not talking about a box of 1/2 doz. knives. The boxes were as large or larger than a block of .22 cal ammunition. And, the boxes were stacked three high in some places.
Some of the knives were single blade Barlows, like yours. Others were two blade Barlows and some were two blade trapper patterns.
There had to have been hundreds of each pattern on the table.
My recollection is the table belonged to Jim Parker. If not, it was right next to his tables.
I guess my point is that whatever they are, they are not rare.
You could get by selling it on Ebay if you aren't really blatant about the KKK connection. List the knife and let your photos do most of the talking.
Ebay does have a policy against KKK items, as well as Nazi memorabilia.
They also forbid switchblades with a blade over three inches, but such knives sell regularly on Ebay. They just aren't listed as switchblades. Certain code words or phrases are used and the photos show everything about the knives except the activating button.
DE OPPRESSO LIBER
"...Men may spurn our appeals, reject our message, oppose our arguments, despise our persons ___but they are helpless against our prayers. "