Schaefer beer sign that actually pours!

Purchased this Schaefer beer sign back in the early 1970's at Englishtown Flea Market in Englishtown, NJ for $25.00. It has a circulation pump in back along with three reservoirs. When the reservoirs are filled with water (or beer) and turned on, it lights up on each side and the pump fills the bottle then overflows into the glass and recirculates. It measures 20"w x 13 1/2"h x 10"d. I have never seen another one like it. If anyone can tell me more about it, I would greatly appreciate it. I hope you like it as much as I do. Thank you.