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 1943!!

Manufacturer: Conmar Products Corp.
Era of Manufacture: Approx. 1943

Zip Teeth:
• Width: 6.0mm
• Material: Alloy of Iron mainly

Zip Tape:
• Width: 21mm
• Color: Olive Khaki
• Material: Cotton 100%

Zip Slider:
• Pinlocking
• Alloy of Iron Mainly
• with Bell Shape Puller

Zip Retainer/End Box:
• Press Process
• Alloy of Iron Mainly

Zip Length: 41.5cm

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