Calor.
Having worked for Calor from 1981 and for many years after that, I've moved my fair share of them. The 12 was just basically a barbecue bottle and was pointless, the 4.5 and 3.9 were steady little bottles that many used and it's strange to think they're going. There was also the 7 Alloy but that was phased out years ago.
As people seem to want a small bottle, why not get a 907 or a 904 Camping Gaz bottle, a screw in regulator will be required, but they're around the same size as a 4.5 and can be bought all over Europe which makes them a much better option for travelling or small scale use.
There are people that fill their own cylinders and I've seen more than my share of those same people with burns, I won't say how it's done as it's dangerous.
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