This Zenith El Primero Chronograph reference 02.2310.400 is offered with an absolute collector's full set. The scope of delivery includes the original warranty card, the original box, the original purchase receipt, five service receipts and the replaced spare parts. This model is in very good, authentic collector's condition, with the usual superficial signs of wear on the strap and case for a watch that is over 30 years old. It has been serviced and treated with care five times in the last thirty years. The dial is very well preserved, the hands show a certain patina according to its age. The band shows little loss of tension considering its age. The Zenith caliber runs absolutely excellently in the normal range with a high amplitude. No pending service.