SCBA, The regulator label is FPI
http://the-fpi.com/. The CABA sticker is , compressed air breathing apparatus, a term used in other countries. The large threaded fitting on the regulator is for the full face mask hose.
Years ago we had similar SCBA's at work. The regulator was on the waist strap supplied by an HP hose and the mask was supplied by a large corrugated hose. The regulator had a low pressure warning bell in it and a bypass valve to swap from demand to free flow.