Unusual adjustable chair (Chorlton M21)

Unusual because it goes quite high and has a foot rest, so for sitting at something like a counter, rather than a desk. The two pictures show it in a low and high position. The stick leaning up against it is a metre rule, to give you an idea of the adjustment range.
The base is a five-legged spider, without castors. Adjustable back.
The gas mechanism is a bit leaky so the usable height range (as pictured) is a bit less than you m ight expect if you weren't sitting on it. And if left to its own devices it has a tendency to raise the seat if you're not sitting on it. When you sit down you can use the height lever to fix the position again.
Has been languishing in the cellar so you'll want to give it a good hoovering.
Collect from Chorlton M21.
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