Original Aircrew Mask Assembly MBU 4 /P Oxygen Mask ,it appears to be complete with hose and intercom, the mike is in the mask, a second mike is include,it has adjustable straps for a one size fits all. It is in very good to excellent condition and was probably used for heavy aircraft like the Transall etc. ,mask is in exellent condion,Rubber is soft and has no cracks,Date 1982,