Price dropped to only D600. It's a steal at this price.
If the shit hits the fan, you need a gas-mask you can rely on.
US Issue M-17 Mask, Chemical-Biological: Field (1 ea). Complete set. Perfect working condition. Includes: mask, full hood, case, filters, operator's manual, extra one-way valves, etc.
This is not some cheap foreign crap, this one is exactly like what I carried for years in the U.S. Army. Everything you need, ready to go. These masks sell surplus for $150+ with no additional kit. I'm letting this one go for only D600, with everything you need.