70's vintage watch mens Eterna Sonic electronic cal. 1550 (ESA 9162) ref. 187T

From 70's this heavy Eterna sonic recently serviced by watchmaker... 

Case:
o   All in stainless steel with marks and scratches all over never polished,  ref.187T, inscriptions on the back, serial number 5802383
o    Fine condition with strong geometry
o   36.5m without crown / 40.4mm lug to lug  / 10.5mm tickness /  22mm lug width
o    Mineral crystal with scratches and marks
o    Original Eterna crown

Movement:
o    Electronic ESA ETA 9162 tuning fork -  serviced by watchmaker on October 2022
(movement was disassembled, washed, lubricated) - quickset date
 
 
Dial & Hands:
    o Untouched in great condition

Bracelet Material: 
  o Original Eterna in stainless steel 19cm = 7.48 inches
 
Conclusion / Condition: 
A piece typical of the turn of watchmaking in the 70s in good working condition

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...