Need info - Omega Seamaster Pro 600m

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Howdy all. Newbie to Omegas. Inherited this from my father. Planning on taking it to an Omega shop this week, but any info is greatly appreciated.

 
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I know the general Planet Icean model, but can't find anything online referencing the "No. 0" notation on back.
 
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First glaring thing is the Helium Escape Valve is directly over the 50 on the bezel. On genuine PO/Seamasters, it's above the 51/52. The second is the limited edition of 0.
 
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Thanks bud! Wife and I vaguely remember him mentioning the watch way back, but had forget about it or what he said specifically. Found it by accident yesterday in a Citizen box of mine in our closet.