Easy
The nice thing about bronze is that what you see is what you get. If there is pitting with light pinkish coloration inside, then you've suffered from electrolysis. If you grind that out and find bright yellow metal underneath, you're ok. If there's no electrolysis, and there's no obvious cracks or stress marks from metal fatigue (highly unlikely in that sort of piece,) it will be OK.
Best
Ben
|