Some brands have shorter crossbars relative to the same size/weight anchor. That might matter most if you have strong tides.
All explained
in this video.
Mine is probably some kind of knock-off as well. However, (and this is from very uncertain memory as I won't be able to verify the actual size of my anchor for a few weeks) your 6lbs and 13" might be in the ballpark of what I have (or just a bit smaller). From the sizing chart, it should be just above the size recommended for 17' of boat. If you have good holding ground (sand or firm mud) that might be all you need. What that other DS owner had looked pretty small to me, and his held once it was set properly.
Also, if the shore is sand, drifting ashore wouldn't necessarily be the end of the world, especially if you are on board and ready to take action (that cot thingie might be a problem in that it might be in the way until you've cleared it.)
Make sure you add 6-10' of chain. That keeps the shank flat to the bottom. Just as long as you don't wrap it around shank and flukes before the anchor had a chance to dig in. That's how I found the anchor on that other boat, with the chain all wrapped around flukes and shank.
Good luck and let us know how things turned out.