70's vintage watch mens Zenith XL-TRONIC Quartz ref. 01 0031 510 blue steel 40mm

From 70's this Zenith with first ETA quartz movement made, recently serviced by watchmaker... 

Case:
o   All in stainless steel with marks and scratches all over, was polished,  ref. 01 0031 510
o   Fine condition with strong geometry
o   40mm without crown / 40.5mm lug to lug  / 11mm tickness /  22mm lug width
o   New generic mineral crystal

Movement:
o    Quartz movement ETA ESA 9180 -  serviced by watchmaker on October 2022
(movement was disassembled, washed, lubricated)
quartz controlled stepper motor
sweep second
date: quickset
electrical hack feature

 
Dial & Hands:
    o Untouched blue with evident of aging

Bracelet Material: 
  o New 22mm croco brown leather with generic chromed buckle
 
Conclusion / Condition: 
Oversize watch for the time with the detail of being the first quartz movement made by the ETA group.

please see photos as they are part of the description.
No box or pappers, no water proof test, sold as is, any question feel free for ask...