Have you looked over on vinylengine.com? You have to register to view library.
I bought a new Phantom II Supreme in 2013, and of course no manual came with it. I was able to get a PDF copy from Musical Surroundings at that time, but they are now no longer a Graham dealer. By all indications, this manual hasn’t changed at all since the Phantom 1, and should be what you need. The cover page lists "Phantom Tonearm" and "Model 2.2 Tonearm". The next page is "Phantom B-44 Specifications", which I believe indicates the 1st version.
I’m happy to email you a copy, but I’m not sure what message options we have here. You can contact me via my handle at gmail, or also same handle on head-fi via PM.
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.