5193 cal. 12.68N

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My very first Longines arrived today, traded for a modern watch, complete with archive info obtained from previous owner
2emu9une.jpg
 
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That's a nice start; a desirable "sei tacche".
Congrats!
 
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That's a nice start; a desirable "sei tacche".
Congrats!

Thanks Larry, had to google sei tacche, still learning so appreciate the encouragement!
 
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That's terrific!

Question for the Longeniuses among us: I am used to taking that 5 digit number off the case back as the reference number, but the Longines paperwork refers to this as a ref 5193. Which is correct? And if 5193, is that expected to be marked anywhere on the watch?