Rolex Twin Lock Crown variants: Experts please see within

[CaveDiver]

Rolex Twin Lock Crown variants:

During my journey into the complicated Rolex parts world I discovered variants to the twin lock crown. I was under the impression that twin lock crowns were phased out by Rolex in the early 70’s with the introduction of the trip lock design series which lead to most twin lock crowns on subs being replaced with the newer trip lock crowns when needed at service. However I have come across variants of the twin lock. If Rolex phased out the twin lock, how did this variant develop? Any experts know how the existence of the variant came about? The pictures below show the variant observed.
This is what I believed to be the only version of the twin lock tube and crown. It has the look of crimped stainless steel housing and a short tube:




Several examples of a variant:
Notice how the stainless steel appears to be pressed over another type of material.

Here is another photo of a different watch showing the variant:



Any info on the differences and when they were/are made?
Thanks

[Dan Pierce]

CaveDiver, sorry, can't answer all your questions but both the twinlock and triplock crowns are used simultaneously on different references. The Sub, SD, DSSD, Yachtmaster use the triplock while the GMT II [older version], Explorer II, DJ, and DD [36mm] use the twinlock.
I don't think they can replace different crowns at service either.
dP

[Welshwatchman]

Troll removed.

[Nicko]

Originally Posted by Welshwatchman

Troll removed.

Troll killer extraordinaire!!!

[CaveDiver]

no one has any explanations?

[Tools]

Originally Posted by CaveDiver

no one has any explanations?

There have been a few variants of the "Twinlock" over the years......

The Sub didn't get the bar under the crown until the early 60's with the 5508 but the first 5513,s and 1680's didn't get the bar and only had the crown... also some were given the "Brevet" twinlock crown..

The Triplock didn't come around until the early 70's, but there was no mandate to replace earlier twins with trips at service, although it's not that difficult to do..

All of the early crowns were crimped (formed) caps around the threaded core. The current monobloc crowns are only about a decade old.........

I guess that I don't really know the question............

[CaveDiver]

Originally Posted by Tools

I guess that I don't really know the question............

Sorry, I guess I was not very clear and relied on the pictures to explain.
I’m referring to the 5512/13/1680 twin lock of the 60’s like the ones in the photographs.
1) I thought Rolex stopped producing these a long time ago. Apparently that is not true and was looking for conformation.
2) Of this style for the 5512/13/1680 of the middle to late 60’s that I have seen until recently were like the crimped ones shown in the first couple of pictures. I was wondering where this other style that has the stainless steel pressed instead of crimped came from if Rolex stopped manufacturing these crowns back in the 70’s. So, does that mean Rolex is still manufacturing these crowns?
Does this help clarify my questions?
Thanks