Thank you for viewing. This is a real, early-model CROWN chevron zipper. The condition is good, considering it's a product from over 80 years ago. However, unfortunately, the top stopper on the left side is missing, and it's a short type, about 30cm long. It's likely intended for use on a sheepskin vest worn over an A-2 jacket, or something similar. There's a small spring inside the slider that automatically returns it, but these springs can sometimes come loose, so it can also be used as a spare slider.