This item was purchased from an aviation surplus sale. I do not know the history of it. It is in good cosmetic condition. It is not tagged as to the condition status or aircraft type. The bag has written on it, "N159WA". These units measure about 1 5/8" X 1 3/16" x 5/16" thick. I am not able to test them. It only comes with what is shown in the pictures.

S563-7 d