These are 100-pack single edge blades from Derby Extra designed to fit DOVO Shavette and Parker Shavette razors.
Derby Extra
Tiger
Feather
Supply
Uppercut Deluxe
Eastern Skateboard Supply
Skate One
Bones
Spitfire
Larry Block
Olympia Supply
Proraso
MüHle
Bonesbearing ボーンズ ベアリング
Daville Skate Shop
Olympia