I found this from an earlier post:
By: nomadgiles : September 7th, 2020-03:09
To précis some web info & add a bit of my own: During the 1970’s Ulysse Nardin used ETA movements as a base. In the case of the UN 36000 COSC Chronometers, the cal. ETA 2826 was used, and the reworked movement was designated cal. NB 11 QU. It features 25 ...