even without the exhibition back. It is a very good size like your 3970 and as stated above it is rare to find a good 130. The 5970 has the same movement but the 37cm (or 36.5mm case) of the 3970 suits the movement better as visible from the case back. Saying that the 5970 is somewhat an iconic watch due to its short production span. Although it is larger than the 3970 , the case is arguably more balanced - the 3970 being on the thick side. You could start a perpetual calendar chronograph collection of course and then add a 5270 to your 3970 and 5970!!