Conmar had been keeping one of Major Zipper Brands since the name registered in 1934 to ended around middle or late 80s. They were used so often on US Military Clothing and Equipments from late 30s through 70s.
This is one of the typical wartime Conmar Zippers.
Dead stock from 1939-43!!

Manufacturer: Conmar Products Corp.
Era of Manufacture: Approx. 1939-43

Zip Teeth:
• Width: 6.0mm
• Material: Brass

Zip Tape:
• Width: 20mm
• Color: Olive Khaki
• Material: Cotton 100%

Zip Slider:
• Pinlocking
• Brass
• with Bell Shape Puller

Zip Retainer/End Box:
• Press Process
• Brass

Zip Length: 48.5cm

Various Purposes for Repair:
• M-38, M-41 Field Jacket, Coat Para. Jumper, C-3 Vest, B-9 Jacket, B-11 Jacket.....