Question Portuguese 3714-01 with C.79240-regulating unit

Good evening to all!

I hope that I can explain my question with my bad English…

I want to buy one nice Portuguese 3714-01 with movement C. 79240 - one of the early S/N from 1999 (original picture of the movement - picture 1).

But what a surprise- the regulating unit is not the “Triovis” regulating, as in all calibre 792xx (picture 2), but the older IWC “Original Valjoux” regulating, as in calibre 790xx. Example - picture 3 – C. 7906 in Da Vinci.

My question – is it possible, that this different regulating unit is originally mount from IWC in this movement 79240, or it is clear, that the regulating was changed later, for example because of repair?

Seems, that the balance, spring and regulating unit are also original IWC parts and exact the same, as in other earlier original IWC movements 790xx. Are not other, for example standard Valoux 7750 chronometre grade parts.

I thought, that it is possible to find this older regulating in the first, or early S/N of 79240, but saw in one other more earlier S/N 3714-01 with 79240 also the “normal” for C.79240 Triovis regulating.

Hope that somebody will help and advice… Thank you and have a nice evening!

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Hi PHIL05, welcome to the forum.
The 790xx regulator system can be found as original fitted parts in a large number of early (1998/1999) 3714-01 watches with 792xx movements. Just like yours. This was a 'change over' period where both systems were used. If required, the 790xx system may be replaced by the 792xx system during servicing but never the reverse. Interestingly the, now redundant, hole for the eccentric used in the 790xx system could still be seen in 792xx balance cocks up to 2009.
I hope this addresses your concerns.
Leo

Hi Leo,

Thank you very much! Very pleasant answer and information!

I also thought the same, but after I saw one 3714 with earlier than mine case and movement S/N, already with the new regulating system, was not more sure.

I suppose, that the new Triovis system is not so much better, as the “old” system.

I wish one very nice day! Phil