I don't think so Nuqi... With the only 300Ts that I have seen that don't have anything in the third quadrant, "professional" is the same width as the SUB 300 line, the one's with the outline logo, are just barely longer, and the anchor logo actually says SUB 300 T on the dial like the "seahunter" which of course has the diver logo.
Yours, and the eBay beater, both have a longer 'professional' line, his aqualung just looks like it's worn from improper cleaning, or perhaps cleaning after being flooded.
*then again, it is a shitty picture.