alright I've been trying to pin down a square button famicom and I've come across a few from my usual seller however for some reason they only post top bottom and close up shots of the serial number and the controllers are almost always in their holders and I cant see any of the buttons.

is there any way to narrow it down by serial number?

I know they only came with shiny bottoms not textured and they were the earliest systems made but I've found that the serial number doesent directly correspond to how many came off the line before it.
I was curious if any one knew of a range of serials that had a higher chance of being square basicly