The knob was probably knurled instead of fluted, I didn't have my "up close" glasses with me so small details are hard to see. Just more of the fun of pushing 50.Anyhow, he had it priced at $499.00 and I thought that was mighty pricey. He said he would entertain any reasonable offer but I was afraid I might hurt his feelings so I passed. I'll go back at some future date and if he still has it we'll see what his definition of reasonable is. It looked to be all factory to me, it was just different than what I've seen. But, The more I hang around here the more I learn, it's a never ending process it seems.