From our personal collection is this: a great condition Nivada Grenchen Valjoux 92. Its case is in exceptional untouched condition and overall one of the best we have seen so far!
 
Make: Nivada Grenchen
Model: Chronomaster Aviator Sea Diver
Reference: --
Year: Circa 1960s
Material: Stainless Steel
Dimensions: 38mm
Crystal: Original Domed Plexi Glass
Movement: Manual Cal 92
Bracelet/Strap: Aftermarket Band
Lug Width:  20mm
Box/Papers: No