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Knilling string instruments are student-grade, but had quite a bit of attention given to them in the USA shop, for setup. They sell for more due to that, though they generally aren't better in construction than other violins. Adding the pickup would of course increase the value. I'd guess this violin sold in the $300-400 range when it was new. If it's in good condition now, I'd guess it would be in the $150-200 range if you were trying to sell it. (There are eBay sellers who try to sell used Knilling violins for what they paid for it, but they don't get many takers.) The several used Knilling violins I've looked at did not overly impress me. (Good sound is what I judge a violin on.)