GSC 1665:1505 is a 14th magnitude star in the constellation Pegasus, that I discovered it to be variable on images taken on 22 October, 2010.
Further observations of the star were made in 2014. These observations confirmed that the star is an Algol-type eclipsing variable, however the data were noisey and there were gaps in the lightcurve. The best determination for the period was about 26.19 hours, but with some uncertainty. More observations are required. The amplitude observed was small, only about 0.15 magnitude.