When Nintendo originally manufactured their arcade cabinets, each one was given a unique model number stamped onto a serial plate which was screwed to the back of the cabinet right above the removable panel. Unfortunately, my cabinet did not come with one but leapinlew over at BYOAC told me he had an extra and he was kind enough to send it to me for FREE! Thanks buddy! Check it out:
For those that may be wondering, the serial plate measures 4" x 1-7/8" and is held in place by 4 small screws. Anyway, it's not a huge deal but this does add to the authenticity of the cabinet (at least to me) even though sharp eyes will notice that this particular serial plate came off of an original Popeye machine (based on the model number). It also appears to be a blank since there is no actual serial number listed. Maybe I'll stamp it with a #000001!