Hello all! I picked up Riverboat Gambler this week and after looking at it closer I think it may be a prototype or early production. I noticed a for sale ad here on Pinside a couple of days ago for a Riverboat Gambler Prototype #9. Mine seems to be similar. I’m questioning if this is a prototype or not because I saw some pics of on IPDB that had a different prototype backglass. It looks like the serial number on mine is #25. Correct me if I’m wrong. Thanks for your input!