Varieties cover buttons.

English

- Blank Square
 

 http://club-snap.su/sites/default/files/apk66.jpg
 

(On the nozzle-plug no information)

- Billet Susan  http://club-snap.su/sites/default/files/apk66a.jpg+ two blocks http://club-snap.su/sites/default/files/apk66b.jpg          =      http://club-snap.su/sites/default/files/apk67.jpg
The button is made in two stages. I made myself pulling button, then serially installed two small grommets. Turns out pulling button with two punctures.

 (On the nozzle-plug no information)

 

German firm Astor-berning - offers a large selection of original pulling of buttons.
http://club-snap.su/sites/default/files/apk68.jpg

Not far behind, and the Chinese company "Shenzhen HDE Garment Accessory Co., Ltd

http://club-snap.su/sites/default/files/apk68a.jpg