Yes, it can definitely be.
I recently bought a 145.022-69 SW with a 30.592.xxx serial, DNN and a Straight Writing caseback.
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It comes from its first owner who bought it for Christmas 1970. The extract I just got confirms production in September 1970, delivered to Switzerland (where its first owner lives).
I had the same doubt and asked the heritage team for their opinion before I buy the watch, they confirmed everything to be okay and correct.
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