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We present photometric and spectroscopic observations of the cataclysmicvariable MASTER OT J132104.04+560957.8 which strongly indicate that it is apolar with an orbital period of 91 minutes. The optical light curve shows twomaxima and two minima per orbital cycle, with considerable variation in thestrength of the secondary maximum and in the morphology and depth of theminima.

High-Amplitude, Rapid Photometric Variation of the New Polar MASTER OT J132104.04+560957.8