Exacta Tessar 50/3.5

I have the 3.5/50 Tessar in an M42 mount. Up until the 2.8/50 Tessar was reformulated in the mid 1950s, the 3.5 was considered the "best" one. I have to wonder if the 2.8/50 was modified again at some point in the 70s, because the black barrel CZJ Tessar I have is easily one of the sharpest lenses I have in my collection (or perhaps improved coatings just make it seem that way).
 
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