yep it's a cheap-ish Taiwanese unicrown fork and probable cause is just thin chrome plating (and plenty of exposure to weather). If that was my Rossin, I'd want a nicer (chrome) fork...but this one looks like it works.
Measure the frame's headtube and that will give a rough number of how long (tall) a steerer you need...I probably don't have a spare with a long-enough steerer, but somebody here might.