My first vintage love was the first generation ref. 666 Ingenieurs, and I have owned more than a few 666 and 866 models. I never developed an interest in the later models, though, so my knowledge of the market is very limited. The price that you paid sounds reasonable, and especially given the condition claims, but I cannot be more specific.
The reference that you bought are nice watches, and there is nothing wrong with ETA-based calibers. But given the importance of IWC, its iconic Ingenieur model line, and the cal. 85x movements, they will never be thought of, or collected with the reverence and passion of the earlier variations.
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