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One on the Drive side seat tube behind where the crank would be
That was for a chain guard. Quite nice as far as chain guards go too.
Similar to this Trek District:
https://en.wikipedia.org/wiki/Belt-driven_bicycle#/media/File:Belt-drive_crankset.JPGI believe the one on the inside of the chainstay was for the same purpose.
We used to sell those in the bike shop I worked in. I always thought they were underrated as a kind of MTB street style single speed. Lots of mounts too.