I finally obtained a JDM shimano calcutta 1000 Chinnu. I posting a picture comparison of three reels sude by side. The reels are similar,the chinnu 1000 spool fits in the the 50 and 50xt but not vice versa. The chinnu has a wheel drag vs star drag in the 50 and 50xt. The chinnu appears not to have anti reverse and by tightening the wheel drag you prevent anti reverse. I am wondering if i could put a 50 anti reverse bearing in chinnu but will take apart in next service to find out