These are Chinese twin swords, from the Qing Dynasty. The swords are known as ’yin yan qi xing jian’, translated as ‘twin seven stars sword’. Both sides of the blade are inlaid with seven brass dots depicting the seven stars or qi xing.
In China the seven stars, known in the West as the Big Dipper, were referred to as the Northern Ladle. These seven stars were said to represent the Emperor’s carriage rotating around the centre of the universe. The constellation was said to govern the Four Directions, and to divide Yin from Yang. It determined the Four Seasons, balanced the Five Elements, regulated the divisions of time and so on.