One new-old-stock Regulator Spring for Swiss 16s Ball-Record movements.  Condition as shown in detailed high resolution pictures.  Assume nothing and use your own expert judgement and the large detailed picture as your guide.

See picture for details.

Good Luck!

See the large and detailed pictures for further information.

Good luck and be sure to check out the many other pocket and wrist watch related items that I have on ebay this week.