These cuff links and tie tack were a gift to my father from a Japanese client, back when the IRS was OK with business gifts. The jewelry was made by Mikimoto, Ginza, Tokyo for C. Itoh and Co., Ltd. as stated on the original box, which I will send. The pieces are marked CI in script, which could also be read as CJ. If these are your initials, you will be getting a bargain. Links are 5/8". The tack is 1/2". Marked silver. Japanese silver is usually 950, but marked only silver, as these were not made for export. See Rezazadeh, Collectible Silver Jewelry, p.181. Never used. Flawless.