Portable instrument for data storage medium

Claim 1

A portable instrument for a data storage medium which is used for a non-contact personal identification system comprising a data storage medium and an external processing unit for exchanging information with the data storage medium or transmitting and receiving data to and from the storage medium, wherein the data storage medium is composed of data storage means and an antenna coil which are electrically connected to each other, being mounted on a base material and is made in the form of a non-contact tag externally sealed with a resin, wherein the tag is secured, at a securing position, to the surface of a transparent cover for covering a time display surface of a wristwatch, the securing position being such a position that allows recognition of the time displayed by time displaying means, wherein the transparent cover has a recess at said tag securing position and the tag is removably fitted in and secured to the recess, and wherein the transparent cover is for an analog wristwatch and has a size falling in a range which allows recognition of indications presented by a minute hand and a hour hand.