are these the ones from germany mate

What a beautiful lamp

We had one of these in our class at collage,wish I'd swiped it now,I remember them being heavy and solidly made things.

mine has just arrived! its lush

Actually now i can see a bigger pic of this the one osram one at our college had a brass skirt at the BC end and no dimples in the arc tube also there was a thin wire wound around the inner arc tube,most likely a starting aid.

This is deffo rebranded Philips.

Go back to the college Gav and swap it for a similar SOX, what you describe is rarer than rocking hoarse poo (with the arching fine wires)and when the college "restructures" the'll chuck it anyhow...
If you've seen it, and you know it exists, and you know where it ts, go and get it!

My motto of many years of collecting rare lamps is...

"Usually you only ever get ONE shot at acquiring a rare lamp in a single lifetime, if you are exceptionally lucky you just might get a second chance."