Sto-A-weigh Troemner Calibration Weight Set 1g -500g

This is a Sto-A-weigh Troemner Calibration Weight Set 1g -500g The set is in excellent condition, however it is missing the third smallest weight. The weight between the 2g and the 5g is the one that is missing. As the picture shows, it comes with other fittings and parts! I inherited the set, and I really don't know anything more than what is written above. I've found a set for $275, however, since there is one piece missing, I am willing to consider all reasonable offers!