Quoted:
So what do you guys think is a going price for a used class 1 vest?
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I sincerely hope you don’t mean an NIJ threat level I vest. These are rated to stop a 158 grain lead RN .38 Special going 850 ft/sec and a 40 grain .22LR going 1050 ft./sec.
By today’s standards, this is an inadequate rating. IMHO, a used level I vest is virtually worthless.
Unless this is an extremely old vest (and if it’s a level I, it may be), it should have a date of manufacture stamped or handwritten on it. You may have to remove the ballistic panels from the carrier to find the date.
Incidentally, Kevlar vests don’t deteriorate with age. They deteriorate from use and from exposure to things such as bleach and ultraviolet light.
Unfortunately, the only way to see if it’s still good is to shoot it - which, of course, destroys it in the process (and bangs up the 10 year old kid wearing it!!).
Technically, there really isn’t any such a thing as a bulletproof vest. A more accurate description is body armor or ballistic vest.