Vintage Old School Diamondback Fleet Streak Mountain Bike Frame 19.5

This frame is in good condition, with some paint chips and scratches in various places from normal riding but no dents or deep rust. The decals are cracked with age and look kind of ugly, but they are holding on well. The photos make it look a little better than it is, please expect it to be a bit uglier in person. I don't know the model year, but based on the Lee Chi brakes I think it might be mid 80s. The rear brake is a U-brake or roller cam only, cantilevers will not work.
Measurements
19.5" seat tube (c-t, the c-c measurement is 18.5")
21.5" top tube (c-c)
25.4mm seat tube diameter
68mm bottom bracket shell
I measured the rear dropout spacing at around 132mm, never seen that measurement before so maybe it was widened from 126mm. It didn't have wheels when I got it, so not sure what the previous owner was doing.
Feel free to ask any additional questions via message.

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