This has been discussed before, this is a FAKE.
They've taken the first instrumental section with harmonica & the solo guitar part & spliced them together to form a fake instrumental. Listen to the original, there is NO harmonica in the verses when Mick is singing.
To prove this I have just spent half an hour doing exactly that but with the original recording so quality is as good as. I've pasted up two verses, one guitar solo, one verse & finally the harmonica solo & ending. I've made sure to include this info in the metadata so there will be no misunderstanding in the future.
Here's my version
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