• Spindle/axle is marked 70 = W =115

    Those aren't the marks I'd worry about, your real problem is the pitting on the races.

    70 would be an Italian BB, so check what you've actually got, and then sling a BB-UN300 in there assuming it's actually just an Italian axle in a BSC BB. If it really is Italian, VP make a beater grade 70×115 Italian cartridge BB, or you might get lucky and find a NOS BB-UN55 in that size.

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