… you need to test J and R from the 70s. Today, Rose means something different than back then. I.e. comparisons to recent production is probably less meaningful.
…the new Calatrava is a bit darker than 5236 - looking much better im real light. 5236 seems a bit brighter, more like „flesh“. Not my cup of tea… Then there are other variants (like 5172) which have a more complex, metallic-like salmon. These are my favorites. More complex than the dial finish of C
…the leap year indicator/mechanism is shifted by one year, i.e. „1“ indicates a leap year on your watch. If you switch to „2“ everything will work „perpetually“. You can then have this fixed during the next revision, but you can fully enjoy your watch and the perpetual calendar until then.
…and 5970 just a later copy with a larger case. The 5970 case is also too large for the dial (they needed to expand it to fit the larger case). The 5970 case is also too big for the 3970 caliber. A preference of some for a larger watch taken aside - the 3970 is superior. And one should always rememb
… the first series (with roman dial) in platinum is the gold standard. Extremely rare. And the first of its kind. but nearly impossible to get in the market.