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I reckon it's an old Dolan Track Champ
https://velospace.org/node/28597
If I remember right they had issues with the seat tube where an internal sleeve was needed for the seatpost and some frames were cracking, also those integrated seat clamps are prone for cracking. Honestly I'd avoid an alu frame with the paint stripped that's been left outside so long, especially with that type of seat clamp.
I don't know if this counts, and it's my first LFGSS post, but...
Was looking for a cheap aluminum frame on Gumtree, and came across this post
https://www.gumtree.com/p/bicycles/fixed-gear-bike-/1436660125
Thought "those pink strips and weord metal frame look a lot like @veganjoseph uber eats challenge bike", upon further inspection... it is!
Bit of a shame there are weeds growing through it, seems to have been neglected.
I would like to know what the frame is though, I'm assuming it's not the Dolan FXE he used with the paint stripped?
(Adding pics for archival sake.)