eBay oddity scout Michael-Anne Rauback spotted this curious enamel sign up for auction. Starting bid is GBP 9.50. The only information provided:
ORIGINAL USED ENAMEL SIGN ,MACHINE MUST NOT BE WORKED UNLESS GUARDS ARE IN POSITION.
COLOUR: WHITE BACKGROUND ,BLACK LETTERS .
SIZE 1 FT 4 INCH'S X 1 FT 2INCH'S.
WEIGHT ,APPROX 4 LBS.
UPDATE: OK, I *know* that the "guards" that the sign refers to are protective coverings, but if you don't spend much time in machine shops, it's still funny to read aloud.