I think its a Schrager and that's why it looks like a Martin which it does. Martin used a different pin and Schrager used pins like this. Those hash marks aren't Ernie's but I imagine are a "tribute" to him, just as many of the aspects are trubutes to Martin.
Please bear in mind that there are plenty of folks out here that know way more about both Martin and Schrager than I, however, I was just talking to Ernie about a cue that he showed me some work on that he attributed to Schrager and it was that pin in that joint with those rings on the shafts.
Kevin