It is a cork cancel. This is a radial geometric design, usually referred to as a "circle of wedges." It is also known as a "fancy cancel."
Whether it adds or decreases value depends on the collector. For a collector simply wanting an example of this stamp, the cancel on the eye may be unappealing. For a fancy cancel collector, it probably would add appeal, although this radial geometric design is one of the most common fancy cancels on bank note stamps.
Makanudo, I was referring to the cancel as being common. Your stamp is either Scott #178 hard paper printing or Scott #183 soft paper printing. I can't tell from the scan which number it is but my guess would be #178 because the tips of the perfs don't show loose fibers. But likI said it is difficult to know for sure from a scan. I hope this helps.
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