My first thought would be is it actually a Kona!?
There were a few frames made for different companies from the same factory as this. Same features, bullet dropouts etc, however, and a big however, all the other frames along with the Kona's which i had documented had similar S/N layouts, usually differing in the first letter for the different manufacturers. And i would have thought this would have had one also if it was from the same factory.
There have been a couple of Ti bikes come through the forum which as far as i remember were never fully identified through various doubts and reasons.