No offense intended, people get touchy about fake logos because some bozo is always hawking an obvious fake on Ebay with a counterfeit decal for high dollars. When you get into the stratospheric level of rare vintage instruments, there is a thriving forgery underworld, the same characters who make fake painting and antiques. Most guitar forgeries are pretty blatant, but an expertly relic'd instrument, often built from at least some genuine parts, can fool even the experts. Unlike paintings, most guitars have little to no provenance. There's a guy who keeps trying to sell what is clearly a Jazz parts bass supposedly once owned by Jaco for thousands, can't remember what it is now
As he keeps changing the price. What balls! Its funny unless you are the sap that buys the fake.