gibson ripper bass

Has anyone done wrong Rippers Gibson?
I have a ripper that I bought in August, the person who gave me said it was sold under the Gibson luthier RPF was built while working at the plant in 70's … the bass has no serial number, the cover of the soul, says the custom, and is held by 3 screws. The logo on the head like a 100% Authentic. The neck is a screw, wrist pin is located on the neck plate … there are no holes in the horn. The bridge looks identical other rippers, but the chain through the structure is different, is not recessed portion in the back, like others I've seen. The pick-up image and sound 100% authentic compared to other rippers I've seen and played. The bass sounds great, feels very well together, I'm curious to know if someone is or has been doing imitations of low, or if it is possible that the manufacturer controls the story?
First: In my opinion, Gibson has not had good bass. Its possible he did in his time free, if you worked at the factory. Gibson (I) merged with the tail neck and bolts. If this is Gibson must have a serial number. If you like what's what matters.
gibson ripper 1979