Hi guys,
To clarify about some enquiry about whether the crown and dial were gen. No, they really aren't but that's a kind flattery :-)
The dial is a reworked (re-made) from a non-Singer plate, done so the date window positions real well like gen. Unfortunately, rolex experts in the vintage gen. fora would spot it in a glance :-(
As for the crown, it does look like a gen post 2001 Sub & SD's new thinner & more fanned-out logo crown, but it's not gen. Plus it's uncorrect for a 1665 SD.
Below is a comparison with a gen.Tudor sub. All original rolex parts, same case like a 5513 sub but with ETA movt (a Ford powered Mercedes :-)). A correct triplock 1665 SD should look like the one on the Tudor.
Tudor above, 1665 below
Cheers guys :-)