Bill
32058
I tried to confirm that fact but kept falling back on 36mm. But you have it on the wrist so I will update the post.
The main difference between the Patek Philippe Aquanaut references 5065 and 5066 is their case size.
The 5065, often referred to as the "Jumbo" Aquanaut, has a 38mm case, while the 5066 has a 35.6mm case, according to some watch blogs. Both models, however, introduced a sapphire caseback, offering a view of the movement, unlike the earlier 5060 reference.