What would a significant discount be? Cost of a replacement, untouched dial? More? Less?
If it's an easy to find dial (and a really nice watch that makes the project worth it), I would subtract the cost of a new dial from the price, plus perhaps 10-15% more for the energy required for such a project. And even then it's not an "original" watch...
If it's an impossible to find dial I wouldn't buy it at all
Here is my 105.012-65, also movement number 2400xxxx, for comparison. Dial type, pushers appear to be the same. I'm quite certain mine is not relumed. I think it's a very nice dial and the lume is not as perfect as the OP dial.