I remember hearing some debate here, as to wether or not 99's came with swivels from the factory a while back. I found this add from 1962, and it shows swivels on the deluxe model, just thought the info might help out.

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Garry
Trump won !!!
Trying to live like a free man in the Communist Republic of New Jersey.
Love your country, distrust your government.
Democrats and the people who vote for them, enemies of America and a free American people