ID vintage?

Case construction looks '60s. Thanks.

Hudson Portable Unit
Model OT371

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late 60's up here,a lot were for home therapy units,and for travellers to carry with them,avoided tipping in a car or home and snapping the regulator,saw many with regulars we had requiring some oxygen therapy,looked neat in the house rather than a tank in the room..
 
I don't remember the end control single gage till the 90's. but the yoke style puts it as one of the early ones.
 
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