I do not recall the manufacturer. I'll have to look into that. The tank is 2 years old. I bought it from a friend who had it in a wall in his entry way. it's been sitting on a stand in my garage for a year. No it's not low iron.
If its euro braced the rim is probably only for looks. They probably just did a sloppy job. I re.over the rim off a tank recently and the silicone up top seemed much much weaker. Just to hold the rim on.