This is a formerly confidential Pfizer Document, which curiously also has some Moderna data also. On page 23, 24, 25 it lists some lot sizes.
Here is a link to the PDF on box
https://app.box.com/s/hmbqmh3haelryh8a362qrkuo2dgrl5nb
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What Are The Lots Sizes for Pfizer Batches? Info From Confidential Pfizer Doc