61-64 bats

[momen55]

anyone seen this before. this bat has 61-64 features, but the centerbrand and powerized are that of 65 and later. i was reading the book and it says that 50-60 and 61-64 are the same except the line under is smaller. i matched this brand with my 65-68 bats and it is a dead on match. any thoughts? other bats like this out there?
42341

[Birdbats]

That stamping is considered by most to be limited to 1964. Most of my '64 Cardinals collection has this same combination of "old" center brand and "new" Powerized.