Up until about 5?(or so) years ago, you could still buy that exact pipe brand new...and it was pricey! About $900! You had to buy from Supertrapp/Vance and Hines as all these companies have been consolidated...and, of course, only offer stuff for H-D and other cruisers, metric or otherwise now. The larger branding indicates that it is not very old. Original pipes built when Kerker was an independent company have much smaller less flashy branding. If I was selling that, (I probably wouldn't lol lord knows if you will ever see one that nice again) I would probably ask $800. No idea if someone would pay that much. There are not many willing to pay for aftermarket performance parts for these bikes anymore. The market has moved to value exactly original restorations and survivors.
In my experience, that is the best performing and sounding pipe you can put on a cb750.