Marking:  (in underglaze blue on back at base of (a)) Crossed swords
 (in underglaze blue on back at base of (b)) Crossed swords
 (in underglaze blue on underside of (c)) Crossed swords / 3 faint pairs of dots
Note: on (a) and (b), the hilts of the crossed swords are drawn with large pommels and similarly-rounded guards. On (c), the mark is composed only of thin lines with short crosspieces for the guards and no indication of the pommels.