A friend of mine found a missing headlamp for his 1909 Mitchell on ebay. He bought it over to my shop to compare it to our Mitchell and mentioned he needed a lens. We keep an old box of lens that was a parts store display circa maybe 1920. My Dad opened it up and randomly pulled out a lens. They are all in brown paper sleeves. He pulled the lens out and it was an exact match. Sometimes it can be a very small world.