I'm with those who think it was caused by shaving and being put away without the microchips being noticed at the time. FWIW, I bought an FWE from a barbers son a couple of years ago. His father had retired in 1980 and the seller was an old man, his father long dead. He had decided to sell off the father's kit. That razor hadn't been honed since before the old man retired almost thirty years before and was as sharp as any I've shaved with following a linen/leather stropping.