Seiko\ Crowns, water-resistant with gasket on the neck of the crown, Japanese shape Shape: 816 - drilled hole 1.60 Products nameVersionshapedimensionsbarrelcolouradditionitem No.crownJapan stlyeSEIKO 35E09NN13.5x0.81.60yellowLength 2.45mm98435E09NN1crownJapan stlyeSEIKO 40MD4NA14.0x0.81.60yellowLength 4.75mm98440MD4NA1