difference in older and newer brinks brass padlocks

[the picker]

i have noticed that the one with the registered mark to the top have spool pins while the ones with the mark to the bottom do not this is between 2 old and 2 new that i have and i didn't know if it was just i or not that noticed this?

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[xeo]

Some of them don't have spools. I don't know which ones don't and I don't know how to identify which ones do. Maybe you're on to something there.

[rerun12]

The newer ones definitely have spools in em, usually 2 or 3