Hi Jon!
Serial 35 - - - - - were made in 1945/46...
The case, dial and tritium sword hands look like a 50's Sporto.
I can't tell for sure but on your pictures, the colour of the bridge seems different... so it may be a replacement which in this case would give us a wrong serial number for the watch.
If you like it, I think it's a very nice one, you may order an extract of archives through Zenith website... it is 120.00 CHF, so worthy only if you intend to keep it.
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