Just idly browsing and saw this post for the first time and see you've already bought this one. Was the 1947 date you gave a typo? The 351 didn't come out til 1949. If I recall, I have one that seemingly dates to 1948 but Ranfft, Maddox, Omega and many (if not most) others are pretty firm on the 1949 date.
I'm sleep-typing as I do this so do let me know.
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