I wish I could have been alive during the 1970s, for it really was the golden age of Arsenal kits. It's not terribly difficult to see why the club didn't change the design for a full eight years; they knew it was already perfect.
An underappreciated aspect of this design is that it mirrors the away jersey of the same period, swapping yellow for red and blue for white. This has everything that one would want in an Arsenal kit, and yet, it does not insist upon itself in achieving its goals.
The crest is beautifully small, the red the perfect shade, the sleeves white with no interference from other designs, and above all, the shirt is free from sponsorship. The best Arsenal kit ever makes one long for the days of Pat Rice and Liam Brady.