First off, I did some research, and no NES consoles were ever produced in or for North Korea. We can see it is an NES case, not the red top-loading Famicom
1, so that narrows it down to either the NES produced for the the western world (America/Europe/Australia), or the Comboy. The Comboy, like the NES, is a variant of the Famicom, for a specific market, in this case South Korea. Because all "Japanese cultural products" were outlawed in South Korea between WWII and 1998, Nintendo licensed their NES design to Hyundai Electronics
2, a South Korean company. Hyundai produced the only Korean NES consoles, in other words.
Here's a picture of a Korean Comboy console:
Notice the black text. As far as I'm aware, that's the only thing that distinguishes it from a western NES console, which has red text- it even says "Nintendo Entertainment Console - Korean version".
So, which is in the picture?
If you look very closely, you'll see black text. It's a Comboy, so, South Korean. Nothing North Korean about it, as far as I can tell, not even a Dear Leader sticker. So how much is a Comboy worth to collectors? I can't find anything on Ebay, so possibly a fair bit, but it's more likely nobody wants one. However, I did see some Comboy
catridges, and they weren't more expensive than regular NES carts. So, yeah, I'd guess that those used consoles right there are worth the standard price for an NES in good condition, about $40-60.
1. The Famicom is the Japanese NES. The NES sold to the western world was designed not to look like a video game console due to the video game crash of 1983. However, it functions identically and can run Japanese Famicom cartridges, if you file the casing down to fit, so the only thing that distinguished it is its casing. The guts are the same.
2. Now SK Hynix, presumably so as not to conflict names with the car manufacturer. They make RAM and flash memory, a lot of which goes to US companies such as Apple, Google, Asus, HP, IBM and more. There's probably some as part of your motherboard, or in your other electronics like a DVD player.