These are pretty rare. These were the first Titan lights that SureFire made. Machined from Titanium, and using a smaller CR2 batter (not included) these were limited to 1000 units, and each was numbered. These are numbers #0535 and #0683. Both of these show wear as they spent a few years on the keychains of myself and my brother. Both of these have been back to SureFire already for a little bit of maintenance, as this design does get a little quirky after a while (sort of intermittent flickering as they turn on). These both work well, but I've seen them do the same little bit of hesitation and flicker, so they may be due to go back to SureFire again. These lights were $500 each brand new, so selling them for $300 is actually a pretty solid deal. Also, that's $300 each, not for the pair.
So, if you've been wanting a piece of SureFire history, these don't really show up very often.