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isn't it just the plastic filter in the bulb holder, they are easy to change?
You are quite right, it is the plastic light guide that set the colour on this model, and later ones - it was paint on the inside of the case before that. Some of the later ones, where the hands come off easily, you can easily swap the plastic - though I'm already short a good green one. But the ones like this one, it's not at all easy.
This is one where the front adjuster act directly on the minute hand, which has a silver centre. So that's fixed securely to the minute drive shaft so it turns the hour hand when you adjust - there's a clutch between the clockwork and the minute shaft to allow that. I expect the hands do come off somehow, and I have another with the same hands where the clutch has gone I think, or the min shaft is too tight for the clutch to drive it. So I can look at how the hands come off as I try to fix that.
Also the front bezel on this 3-clip blue one had definitely not been off before I removed it - I did that cos someone had broken the 3 clips off to hammer it into a Cortina 1600E and it needed the Kienzle guarantee expiry device fixing (they call it a fusible link).
So, all in all, I reckon it was made with the 3 clips and a blue plastic insert. And so, maybe a bit rarer than the green ones, even if I could make one from one each of the right triumph and rover/ford clocks.
I've since seen another like it on eBay from a firm that seem to deal mostly in Roller bits, but I can't see any pics of Rollers with a Kienzle quite the same as this.
Graham