Vintage Lif-O-Gen 300 portable emergency oxygen tank Original Box Sealed nozzle

Description

VM b Vintage Lif-O-Gen portable emergency oxygen tank With Original Box A2. Condition is "New".
This will obviously shipped ground.
The seal on the tank is still intact, this was unused. I don't see an expiration date on the box, tank, or paperwork. I could be blind but I couldn't find one. Nor can I find a year.
This is a great collectable.