Everyone refers to a "Sebenza-style" lock because this was the first folder (at least popularly known) to use a thick liner-lock mechanism as its scales, without any additional scale material. People also call this an integral lock. Benchmade simply copied this, and has now applied their own name, "Mono-Lock" in an attempt to differentiate their mechanism from the one they copied (without formal agreement, as far as I know). They have actually modified the mechanism in newer Pinnacle models, so that it has a narrower locking bar that requires less factory work to keep from "sticking" - now the lock looks less like Reeve's but almost exactly like that on the Columbia River Knife & Tool S-2, another Reeve-inspired integral lock that looks substantially less like the Sebenza.
James Mattis, our fine moderator and owner of Chai Cutlery, has some fabulous digital pics comparing the Pinnacle and Sebenza on his site, along with a few shots of the S-2 as well: http://www.chaicutlery.com/