Looking at your photo of the serial number stamping on IPSND, it looks like where the black paint is flaked off around the edges, there is not only some red paint visible but also some blue paint. Can you look at that up closely and see for sure? If that's the case, perhaps the cab was printed blue first, then red, then black, like they were trying out color combos in some unorthodox method. Either way, very cool find.

Here's part of a screen capture from your photo on IPSND where I zoomed in on the 6. There's definitely a layer of blue underneath the red.

I'm actually surprised that there's red showing up underneath the black paint also. To me that would indicate that the entire cab was painted red first (and possibly blue before that), then black over it.

6 (resized).jpg

Pinball archaeology!

You can rule it out as a former Jungle Lord, as the main cabinet for the four double playfield games was a little taller in the back. The most recent blue cabinet game was Alien Poker at eleven months prior to Barracora, and the only games released between the two were the double playfield games. Likely it's either a repurposed Alien Poker, or a blank cab that served as a vehicle for testing paint colors.

Have you checked the top of the backbox for other serial numbers? I wonder if there's a different stamping up there.

Could be a leftover Pharaoh backbox, before they stamped it. 506267 is nearly at the end of the Pharaoh run.