The BB threads appear to have been tapped before media blasting and A shop isn't going to charge you much to chase out the threads.
Most bottom bracket shells have an internal thread to accept bottom bracket The Park Tool Bottom Bracket Tapping and Facing Set BTS-1 will prepare thread and also allow facing of the shell. Italian, 36mm x 24 TPI.
Or have someone re-thread the bottom bracket for me? . I'm taking it to my LBS to see if they can chase the threads and I suppose face it up not easy to find a bike shop with the tools to clean italian threads I can tell you!.