Very good clild's life jacket, with auto inflation and integral harness.
Label says suitable for 46-90cm waist belt size; Min 15kg child. 
Tested yesterday - holds air for >24 hours.
Waist belt, back strap and crotch strap are all adjustable.
CO2 canister looks in excellent condition.  Hammer mechanism is out of date - simple home job to replace (approx.£15 - or £25 if you want a new CO2 canister as well).
Also listing a very similar Bluewave one - would take a discount for both.