I recently acquired a nice playing and sounding A3, probably a 1920 from what I've seen on mandolin archive. Looking closely I've noticed the sound hole is not perfectly round. The curve is a little off on the treble side. Is this common or is it a problem? Does it affect the value at all? It appears to just be carved this way. Is it just less than perfect workmanship perhaps? I've done a lot of reading but I am new to owning a vintage instrument so any info or educated opinions would be greatly appreciated. Thanks.
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