321 Seamaster dial with coat hanger “S” - something I’ve not seen before

In my limited exploration of 321 Seamasters, I’ve never seen a 321 dial with the notorious coat hanger “S” that appears on some late 50’s to early 60’s three-handed Seamaster dials. All of the 321 ones I’ve seen have the rounded bottom “S” like this one from the early 60’s.



I recently ran across this dial. From my in-hand examination, it appears to be a legitimate, period dial dating to the early 60’s. (See the shape of the “4” in the running seconds subdial)



Given the style of the hours markers, maybe it’s a service dial from the mid 60’s?

So, thoughts? Am I missing something? Anybody have a 321 Seamaster with a coat hanger “S” dial?

Tell me that they are not unusual and everybody’s seen them....

There is a pic in the omega bible - ref. 145.005

Already saw such a dial for sale on ebay some months ago.

Quite interesting as omega stopped the coathanger S with the Seamaster 30 models already in 1962.
Ref. 145.005 should be some years later.