What is this Crestworth base and cap?

[Astralav]

I bought what I thought to be a Crestworth Telstar.

It was fitted with a Living Jewel bottle with a Nordic cap (the short ribbed one).

Pretty unusual combination but I'm sure it's from factory.

After checking with a normal Telstar, mine is definitively special.

It looks the base is the same as a Mark1 table lamp (same black plastic bottom with same writting like a comet one but with green felt on it / this is not my pic here).

shorter and different shape than a Telstar.

I think it might be an export Telstar:

As you can see, this base is larger:

I think it is the same as a table lamp mark1, but maybe sold as a Telstar export.

I found another one, and I have this cap too:

So what do you think it is?

Thanks