Is the 57 a coaxial? I don't think it is.
Either way if you already have a vintage speedy stay legit and get the Zenith. I am no expert on movement wear but it's not like I see a lot of complaining from zenith owners, including me, on the performance and durability of the primero movement. Quite the opposite.
But at the end of the day for me it's about covering more ground with your collection. I don't think the modern 57 has that much to offer. Great aesthetic , but a little gimmicky like the smp300 master coaxial. Just my opinion.
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