Yes it's a 22 mm nato. Much better then the original strap. Jays and Kays strapadapters, after I bought these I discovered that they also have adapters for 20 mm, so can can use the straps with more watches. Instead of starting at "12" I started at "6" to mount the strap, looks better
I am about to buy a gwm 5610u, jays and kays 22mm, and thinking of nato and perlon straps from either crowns and buckles or CNS, but I hear crowns and buckles is better so I might shell out for the extra cost.
Display is good to read. The alarm beeps are useless, you can only hear them with the watch close to your ear, but that seems to be with almost all G-shocks.