I really like pens with ink windows, though I don't have many. 2 questions related to them:
1.) Is there a safe (and hopefully easy) way to restore vintage pens' ink windows back to their original color? I have a Sheaffer Lifetime Balance that writes really well. The ink window seems dark and I imagine that this material has changed color since it was first manufactured, though I'm not sure if this is accurate. If in fact there is discoloration that has happened, is there anything I can do to get that lightened up, making it easier to see the ink inside the pen?
2.) What current production (not custom) pens have ink windows? Those that come to mind are:
Lamy Safari and Vista