HEMMI Calculator Slide Rule No. 45K Showa Retro Antique Collection with Case Slide Ruler ・Total length 23.5cm Thank you for looking. The conversion ratio paper has stains but is still usable. It is about 40 years old, so the outer box is not torn but is dirty. I think the inside is still relatively clean, but there are some stains and scratches due to age and use. The slide part moves smoothly. Please consider purchasing after viewing the photos. Thank you.