Zenith Black Pilot 143-6

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Thanks. I thought that the radium had somewhat lost its "footing" and spread across the dial..

Cheers
 
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What is the difference between the cal 143 and cal 143-6? What does the suffix imply?

I assume that the 143 is earlier and typically without Incablock, whereas the 143-6 is later and shock proof? Here is a 143.