Guys, as malocchio points out, OR used to have sage oil in it. The name, I'm sure comes from that fact, and therefore the "oh-sage" pronunciation is correct. We have Osage Orange trees around here, and never even considered any other pronunciation.
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And that fact, combined with reading the label on the vintage bottle in the picture, puts the question to rest.
And now, no longer hooked on aftershave phonics, I'll await the delivery of my bottle of Osage Rub...