Found a brand new, unused Pong console from 1979 in an Edinburgh charity shop for 20£

How long did it take to download 45 years of updates?
- The very first pong game system did not use software, which blows my mind. OP's does not appear to be the same version but it's possible this it also does not use software.
  
  Am I too stupid...how did it work?

It works but my polish PAL tv doesn't seem to like it very much, it took a lot of tuning to get this wonderful image.
- Mmm... realistic
  
  Colour is also not very accurate... unless they mean a single colour, green.
- Might need recapping, think vblank and blank are drifting.
- Was it meant to run on an NTSC TV?
  
  Unlikely. It is spelled "Colour" on the box, implying this would be for the UK market.
  
  Found in an Edinburgh charity shop, so while it's not impossible, it's unlikely.
  EDIT: Also, an NTSC signal on a plain PAL TV would be black and white (not even false colours) even if you got an otherwise stable picture.
  It's easy to forget, but these old systems didn't connect to the TV with composite RCA connectors, but via RF. So we're not just dealing with straight PAL, but with PAL over a broadcast system. Scotland was using PAL-I for broadcast, while Poland seems to have used a combination of PAL-D and PAL-K. Differences in channel ranges and bandwidths, and sound channel offsets, could make it difficult to tune a TV set designed for one system to a signal from another, especially if it's a more modern set designed for automatic operation, as OP's set appears to be.
  
  No, Radofin was a UK-only brand.

How's the doom port coming along? /s
Looks really neat!

That might have Pong but it isn't Pong.
- Obviously but it is a Pong Console, it's the category started by the original Pong.
  This one has a bunch of additional games too.
  
  According to the box, it is noticeably missing Pong.
- we had an all black console that is like halfway between that the whats in the OP. it had wired controllers and 4 versions that you cycled through to choose. I think it was pong, doubles pong, hockey, doubles hockey. hockey being pong where you had to get it in the goal in the 20% of the middle of your opponents end but the other 80% was just like the side walls.
  
  I have a Binatone one in a crate here with essentially the same selection of games on it. It was a really common thing to clone, there was one chip that played them all.

Was not expecting to see my city here.
- Honestly, I envy you, Edinburgh is incredible.
  Btw, there's a second pong console for a similar price in that charity shop, if you're interested and if nobody's got it yet :)
  
  Thank you, Edinburgh is a beautiful and lovely little city, i reslly hope you enjoyed it. Which charity shop was it may I ask?
  
  What do you mean, Edinburgh? The city in question is Prague. See the console brand, it's from Prague 16 (Radotín).
  !prague@feddit.org
  Edit: /s
  BTW the Czechoslovak electronics brand TESLA also made a crappy Pong console using a presumably stolen chip design.

I wonder about the "Colour". Did they actually use the different video outputs of the AY-3-8500 chip for controlling different colour signals instead just joining them as a luminance signal?
For those too young to know: The AY-3-8500 (or AY-3-8500-1 fo NTSC) chip is at the heart of almost all of those pong-type consoles. It has a number of different (but synchronized) video outputs for left player, right player, ball, numbers, and playing field, and most consoles just or'ed them together into luminance (Y) to make a simple B&W image. You could route some signals to the R-Y and/or the B-Y signal to give them some basic color, e.g. if you sent the "ball" signal both to the luminance and the red (R-Y) channel, you would get a red ball. All this needs are a handful of simple logic gates.
- If it's any indication, the manual says:
  
  It basically tells you that you can basically tone the "colourness" (i.e. the brightness of the colours) up and down, which was a normal control (like brightness and contrast) back then. This is not about being able to make a red playing field green by some setting on the TV. You just had some potentiometers to play with the pre-amplification of the luminance and colour signals.
  What could be in the instructions would an explanation of the games telling you that e.g. the playing field is green and the ball is red or somesuch, then they actually did a (rare) "colour implementation" of the circuit.
  If you are interested, there is a number of interesting documentations on this pong chip on the net.

https://www.youtube.com/watch?v=cNAdtkSjSps

I had a black and white version of this.
All the games were basically the same apart from the target shooting game.

Really good condition, brand new and unused is taking it a bit far.
- No I mean it literally, it was wrapped in all the factory plastics and has literally zero wear and tear. It might have been taken out of the box and maybe used once or not at all.
  
  Check the capacitors anyway please.
  
  Damn. If you'd kept it wrapped, you might have been able to sell that for a LOT of money