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The SD has always had a SELs (at least through the 90s) but the 16613 did not get SELs until much later - don't recall the year. My 1994 16613 did not have SELs. Why it took Rolex so long to do the update is anyone's guess.
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Omega Seamaster 300M GMT Noire
Omega Seamaster Aqua Terra 8500
Benson 1937 Sterling Silver Hunter
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