I believe there is a new level of fake out there. I purchased a 149 on ebay and 146 at the same time. The 149 came. Unremarkable, but glowed red when backlit, ect. But the nib was a fine scratchy feel. I wasn't sure to its authenticity. Then the 146 showed up. Heavier than the 149 (incorrect), wrote flawlessly. Looked closer at the 149, the "rectangle" on the clip, at the top, on the 146, it rolled all the way to the body of the cap, fake didn't. Piston filler or no, there are good fakes