You're correct, case finishing doesn't change much. The case construction does change quite a bit though, and applying the finish can take a lot more effort.
Prisma_Cosmos
The sound module is original to the watch, supposed to play when you open the lid. I’ve seen a few like this, with various cases and dials. Presumably made late 90s.
Here is another on ebay https://www.ebay.com/itm/325506655217
It is not a clone, it's a modded broad arrow, obvious from the movement. Its a real omega, and that's the box it came in.
It looks like a modded broad-arrow. That's obviously a real frederic piguet movement, so $1850 is pretty cheap.
Swap the locations of the two Bulovas
The Seiko India website lists the country of origin and manufacturer of individual Seiko models to comply with India’s import laws. None of this is surprising, and mostly just confirms what was already assumed.
Note that this is just the factory the finished product leaves, Seiko Watch Corp. and Seiko Epson Corp both own multiple production sites all over the world, and a large network of third party suppliers, many of which are unknown.
No watches originate from Malaysia or Singapore, though SII and Epson Precision Malaysia both operate watch factories there, presumably making parts, not complete watches.
Summary
China (Guangzhou SII)
- 4R Prospex
- Seiko 5
- 6N quartz
Japan (Morioka SII)
- Almost all presage models (even 2R and 4R ones)
- 6R and 8L Prospex
- King Seiko
Japan (Epson)
- Astron
- A handful of presage with special dials.
Thailand (Epson Precision Thailand)
- Almost all Solar (besides Astron)
- Coutura
- 7N quartz
Wouldn't EVs be more like the Swiss quartz movements that beat the Japanese and Swiss mechanicals (which would be ICE)?
You didn't account for the price difference between the watches you mentioned and the Seiko
The Seikos with the -10/+15 spec have the L movements and are generally over $3000
- That is 4 times the price of a PRX
- That's more than 4 times the price of a Hamilton Kahki
- Almost 3 times the cost of a CW12
- 1.5 times as much as a Longines Conquest
A compass won't tell you anything.
Crazy coincidence how so many brands have the same "in-house movement" these days
Google "SAC08002F" and you'll see a million results for it. It's an old reference.