550 Movement in a 165.024 Question

tech396 · Feb 14, 2025

I've read somewhere about the earlier 165.024 used a 550 movement until approx 1966. I cannot find that document now. Can anyone shed some light please. Were they phased out by 67 or with the introduction of the big Triangle , ..... USA movement shown. .

Davidt · Feb 14, 2025

550 was generally used in watches exported to the US to qualify for reduced tariffs.
Perhaps we should be looking at something similar now

tech396 · Feb 14, 2025

Davidt
550 was generally used in watches exported to the US to qualify for reduced tariffs.
Perhaps we should be looking at something similar now

Thank you David, yes, this is a USA version. I'll edit my post, thanks. I like the tarif " dig"

Knudsen1971 · Feb 15, 2025

Based on what I can see from the serial number is a NOV66 US batch.
I have never discovered a rule in using big triangle dial for civilian market. From my own db of 148 pieces of 165.024 non military watches only 34 are having BT dial. So roughly only one of four was BT dial watch, which makes them rarer.

550 Movement in a 165.024 Question

tech396

Davidt

tech396

Knudsen1971

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Perhaps a good reference for how original lume looks like on a 165.024 Seamaster (no pin hole)

Is it legit, for it to house a caliber 550 movement?