That "L" is right where the "II" goes on a Phantom II or Supreme wand, but without the dash. In your case the "L" might be an indicator to the arm wand length. My 10" Supreme wands have "XL - 10" inscribed on the barrel facing down, not next to the Phantom logo though. Maybe the 12" wands are "XXL"? I only have 10".
Yours is in all probability a Phantom 1.0 wand. Yours should have an elliptical headshell (not rectangular). I think the main difference is 1.0 wands were ceramic, and then he switched to titanium. I read somewhere that some hapless audiophiles were dropping and breaking their ceramic wands.