Ebel brought these out in 1986 for their 75th anniversary, helping to resurrect the El Primero after a decade of dormancy. The Ebel cal 134 was almost always a cal 400 El Primero, though I think I have seen one using a transitional cal 40.0. This movement wouldn't have been finished until at least 1986. I would guess this one comes from the late 80's, and probably not later than the early 90's. How old? This old:
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