Large item lower left - barrel complete. This was replaced because the watchmakers in the service center are so pressed for time that they can't take 5 minutes to disassemble the barrel, check it for wear, prepare it for a new mainspring, and assemble it. Likely the only part that really needed replacing is the mainspring, but this is common practice at service centers, even though it's incredibly wasteful.
Brass wheel above the barrel - this is the third wheel and I can almost guarantee the lower pivot is worn - common on the movement.
Larges bridge flipped upside-down - this is the barrel bridge, and the area on the lower portion of the bridge where the ratchet wheel driving wheel rides is worn - fairly common area for wear in watches that aren't serviced regularly or have been in use for a very long time.
Wheel at the very top of the photos - intermediate escape wheel - likely replaced doe to wear or build up of residue on wheel.
Wheel at the very right side of photo - co-axial wheel - likely replaced due to worn teeth.
Cheers, Al
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