SABRE was a brand name used for many years by Cole National, a consumer products company located in Cleveland. In the late 1960's, Cole also acquired KABAR and owned that brand for many years. KABAR knives were Cole's premium brand and SABRE was their low end brand. They also had a mid-range brand MONARCH.
For many years, it was common to see combined displays of KABAR and SABRE knives in hardware stores.
Over the years SABRE knives were sourced from Germany, Japan, Ireland, and the US. The very last ones that I saw in the late 90's were made in China.
As far as US manufacturers of the SABRE brand, Ulster made some in the 1960's to 70's. Later Colonial made quite a few. I think that the posted knife was made by Colonial, though Colonial did not own the brand name.
I have recently seen some inexpensive lockbacks with the SABRE brand, so some new company may have acquired the trademark.