According to Official Guinness Records,
The smallest nautical knot board measures 5 cm (1.9 in) wide and 8 cm (3.14 in) long, achieved by Talabathula Sai (India) in Andhra Pradesh, India, on 28 December 2017.The knot board includes replicas of 12 different knots.
For a complete list of 2017 records, please visit 2017 Guinness Records in India.