any idea on this square zenith?

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Little help needed here... Does anyone have an idea on this respirator-ish watch? This one has no second hand and I’m curious to know if it’s missing or born this way.
 
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It’s missing pics of the back, case back and mvmt 👍

What does respirator-ish mean? 📖
 
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That style had both versions. The crown is probably been replaced. You can see in the pics that they had a thin crown to match the case. Look at the buckle style as well. Not the usual short signed one.