Finnaly found the answer to my own question. The post 64 began w/ sn 2,700,000 the only way that I found that was typing in random sn's on oldguns.net before it came up with a line that stated that. SN 2,700,000 was made in 1963 but is considered post-64 because that was the first made when they changed the process they use to manufactor them.
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