SM 166025 SC-62 with a 18k striped dial

Hi All. I came to this 4 year old thread ‘SM 166025 SC-62’ because it was the only link I could find to this reference number on the web.
The revived discussion has been very interesting, however I’m not sure (confused) I’m any closer to defining the origin / history of this model reference (unlike 166020 for instance).
The latest ‘feeling’ from the forum seems to have morphed into it being a later 14770.
I’m still no closer I feel to understanding what this more uncommon ‘025’ means as opposed to the more common ‘020’. Conjecture has ranged from the ‘5’ being ‘English manufacture / assembly’ to a 18k Only ‘luxury’ range, and even a mid-stamped 166020. There have only been three found of the 166025 I believe.
Does anyone have a confident description of the meaning and origin of 166025 SC-62 ?

166025 is a Swiss reference manufactured by Serva S.A. in La-Chaux-de-Fonds and it is likely a replacement for 14743.

There are no links between 166025 and 166020. 166025 has a different lug profile and is exclusively a gold watch.

There are no links between 166025 and 14770 neither, for the same reasons.

166025 is NOT an English reference, it is a Swiss made watch.

The crown is also different, with a different crown gasket.