Fits my seiko srpb43 20mm lug perfectly. I was skeptical seeing other reviews that showed a 1mm gap in their 20mm lugs but fits mine just fine.
This is the best watch strap on the market for tropical climates. It’s light, water proof, easily washable, long lasting, and has a vintage classic design. I don’t know what else to say, but it’s a great alternative to the NATO.
Fit and wear is nice and comfy. A bit scratchy at first, but after a day or so it’s gone. I got the 20mm and it fits really well on my Speedy Auto which has 18mm lugs.
I was expecting something different, based on the pictures and descriptions. I was schocked when I opened the package at how different it was than expected. Having said that, it's by far my favorite -- largely because of the mm-by-mm adjustability. I'm constantly adjusting straps (one of the reasons I gave up bracelets) and thought a good RAF/NATO was fine until I tried this. It's light and airy, dressier than an RAF?NATO, and "infinitely" adjustable. The pin on the buckle could be a bit more robust, though. This is my new day-in, day-out strap.