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Victorinox introduced ))Plus-Scales(( on some 91mm knife models in 1993(Date needs verification). These scales have a slots for toothpick, tweezers, and a ballpoint pen; sometime later a small hole was added for a ))Straight-Pin((. The pin can be very useful for removing slivers (splinters), or activating small electronic switches typically used for resetting, or setting electronic devices. The ))Straight-Pin(( is made from stainless steel.
After the pin-storage-hole was known on the ))Plus-Scales((, the storage slot started to appear on standard Cellidor scales. Many standard models now contain a hole to carry the ))Straight-Pin(( even if the actual pin is not supplied with the knife when purchased new.
Information from Victorinox dated 2010.02.08 indicates that the straight-pin was first introduced in 1991. This information may contradict the 1993 introduction of the ))Plus-Scales((, or it might mean the straight-pin did in fact precede the introduction of the new scales featuring the ballpoint pen.