My knowledge of Seamaster 300's is pretty limited. But based on what I know about speedy's, they added a "T" to "Swiss Made" around 64-65, I believe? This was to mark the dial as containing tritium. The absence of the T might indicate pre-64/65 era. From what I've read. the 2913's had either broad arrow hands, or a combination of dauphine/arrow. I haven't found any references with a dauphine minute hand, as this one has, assuming it's original.
Don't take my word for law on that, but since no one else has responded I thought it worth chiming in with my little knowledge.
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