You can use a non-O-ring chain but you may not be happy with the results. O-ring and X-ring chains have sealed in lube and require much less TLC overall. Less internal wear and chain adjusting make the added cost justifiable over time.
O-Ring chains have one seal while X-Ring chains have two seals to provide even more longevity to the life of the chain.
Most OEM chains are O-ring to the best of my knowledge and seem to be an industry standard.
Now that my interest has been peaked, why are you asking? Are you thinking of using a non-O-ring chain or just wondering about the use of an older design of chain?
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