as the caliber has newly been reengineered and manufactured compared to the Patek 27-70 caliber which was also a reengineered Lemania version but an older one.
By looking at multiple pictures of the 27-70 in 5070 and 5970 models, I always have the impression that the execution quality of the inner angles varies hugely. Some are round and not sharp and I could still not find a pattern how the better finished versions were distributed as one can find them in both Patek models.