Mike,, with all rings,,or most,,there was more than one maker.. Some just bought dies from a big company, made a 100 rings or so and when the die wore or broke that was it.. Some copied and produced their own.

IF this is very thin thats a good sign.. I see where the right lower half might be from a worn die.. IF the inside displays no problematic signs what is the problem?

Authentic rings are not cheap,,,sometimes you stumble upon one as you have before and thats a blessing.. Sometimes you gotta pay. The choice is yours alone. ..