... and injectors...This stuff is confusing at first....There were basically 3 sorts of Single Edge blades..
1. Hollow Ground Blade SEs ...Early Lather Catchers & Hoe Razors..etc
2. SEs that took a stropping blade...Later lather catchers,1912, 1914, 1924.. etc
3 SEs that took a Modern Gem blade ...Micromatic Family and subsequent razors