Who Can Identify This Moonphase-date-chronograph For Me?

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Model reference, caliber, anything? I'm having the worst time nailing it down.
 
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Member (LouS).....This is very very similar...hope it helps.
18kt GOLD LONGINES CHRONOGRAPH calendar moon phase C 502



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vintage MINT 18kt GOLD LONGINES CHRONOGRAPH calendar with moon phase Cal.502

Really vintage master piece that not seen every day in EXTRA MINT condition!!!!

Mint 37x44mm (not inc crown), 18kt solid gold FANCY case, snap back type.Fancy onion crown,

clean and clear original crystal.

Mint ORIGINAL Longines white dial,Moon phase on six and chrono registers, original hands.

MINT original perfect condition Longines 502 mechanical movement!! PERFECT WORKING ORDER WATCH AND STOPPER.
 
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The 502 is based on a Valjoux 7733. Longines started using it in the mid 80's. Nice watch but nowhere near as valuable as their inhouse chronographs.
 
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Thank you all. I couldn't imagine what the movement inside was - and I never would have, as I had no idea there was a moonphase pointer-date variant of the V 773x