Seiko\ Crowns, water-resistant with gasket on the neck of the crown, Japanese shape Shape: 818 - drilled hole 1.80 Products nameVersionshapedimensionsbarrelcolouradditionitem No.crownJapan stlyeSEIKO 40MK1NN14.0x0.91.80yellowLength 5.00mm98440MK1NN1crownJapan stlyeSEIKO 40MC5NS14.0x0.91.80steelLength 4.45mm98440MC5NS1