vintage watch mens Hexagon case Vulcain Royal Flush automatic ETA 2452 RARE

Very rare model in working condition, recently serviced by watchmaker... 

Case:
o  All in stainless steel with marks and scratches all over,  ref. T5623D
o  Fine condition with strong geometry
o  39mm without crown / 42mm lug to lug  / 10.5mm tickness /  21mm lug width
o  Plexiglass with scracthes, and cracked between 4 and 5 o'clock
o  Original signed crown

Movement:
o    Mechanical automatic ETA 2452 - 25jewels -  serviced by watchmaker on January 2023
(movement was disassembled, washed, lubricated) 
advances approximately 1 minute per day, which is acceptable for a vintage watch

 
Dial & Hands:
    o Untouched gradiant brown 

Bracelet Material: 
  o New 20mm dark lizard brown with generic chromed buckle, Also together is the original vulcain steel bracelet.
 
Conclusion / Condition: 
A very rare and unique piece due to the shape of the box.

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...