- Type 21 has a glossy black dial; the dials of the Type 20 models are so far matte (brown, green, black ...) - Type 21 has a lume triangle in the bezel; the Type 20 have (now) a black colored triangle at "12" in the bezel - Type 21 has the "crown logo" (...
Only machined steel on the 20 with no fill (same for my triangle at 12, no paint fill, just metal). I prefer the all metal bezel without paint, but it certainly is harder to read quickly. I do like the brand name and logo on the 21, and less dial text ove...