bo
35
with apologies to Asi
the Rolex 618 w/ 15 jewels had no shock protection, and the 17 jewel variant had Incabloc shock protection. be aware that this knowledge comes from Asi, hence my apologies to him. 
bo
incabloc in original 3646?
By: 0808 : May 8th, 2008-00:34
Hi Asi, Recently, i have been reading and doing a bit of research on the 3646. I remember seeing majority of the 618 fitted by Panerai came without shock-protection (I compared the vintage picture with AT's PAM21) or is my eye-sight giving up on me..=p Pl...