Do 3590.50’s always have matching serial numbers?

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You can check the s/n for free on ilovemyspeedmaster.com

ilovemyspeedmaster doesn't check whether it's genuine, it just guesses at production date based on serial numbers seen.

However, where you can check the serial number for free is your country's Omega Customer Service email address. Ask them if they could please perform a reference check on the serial number and in about two days they'll let you know.
 
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Salmon sushi.
Grilled salmon.
Salmon jerky.
lol and bagels.

Save the salmon for foods.
 
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FFIS
first fish in space edition. Complete with limited edition fishing pole
 
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Check what exactly?
When it was likely produced. asrnj77 indicated he wanted to know it.
Edited:
 
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Does anyone know when omega started engraving the serial numbers on the speedy lugs?
 
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Does anyone know when omega started engraving the serial numbers on the speedy lugs?
Early 90’s or so.