Nikon 8X30 A series (2nd version) is the grandfather of a famous contemporary Nikon 8X30 EII. But I will rather compare it with the last Carl Zeiss 8X30 porro. At a first glance they look very similar, although Nikon is a bit bigger, let's say chunkier, but they weight exactly the same. Also, optically they are pretty close, and Nikon seems marginally brighter than Zeiss. Which surprises me a lot. A big compliment to much cheaper Nikon. Unfortunately, they share the weaknesses, too. Both images have too much yellow tint for my taste. Nikon is very well built, only focus knob is too stiff, but not unusable.
Second opinion: Simon Spiers