Hi Andrew,
glad to find a Zenith forum now!
As you know already - I mainly collect vintage Omegas...
But I think when collecting watches one has to own at least THE Zenith icon: Cal. 135 chronometer
So I have added 2 examples to my humble collection:

As you can see this is a SS version, all original and near mint condition Including original "star" winding crown and steel buckle.
And here comes a picture of the famous Cal. 135

The second one is in a 9K case made in England - has British hallmarks...

Kind regards
Erich