1894 20160701171655.0 10.1093/mnras/261.1.1 DOI ASTROimport-51 Balona, L. A. 1993 The extraordinary early-type eclipsing binary HR 2680 Photometric observations of the HR 2680 (B5V) star using Stromgren-b and Stromgren-uvby filters carried out in 1990 and 1991 are reported. It is found that this star is a single-line spectroscopic binary showing partial or annular eclipses with a period of 8.1 d. A light variation with an amplitude of 0.03 mag can be seen outside eclipse which can be interpreted as two oscillations, with approximate periods of about 1.19 and 1.28 d, but the periods are not constant. It is suggested that the star is a member of the 53 Per class of line-profile variables. The extraordinary variability of HR 2680 outside eclipse makes this star unique. It is suggested that the star could be used as a test bed for stellar dynamics and nonradial pulsations. Cuypers, J. Monthly Notices of the Royal Astronomical Society 261 1993 1-10 http://esoads.eso.org/abs/1993MNRAS.261....1B published in REFERD