  One of the goals of the Pulkovo program of research on stars with large
proper motions is to reveal among the low-luminosity stars those that have
evidence of binarity. Twelve astrometric binary candidates from the Pulkovo
list have been included in the program of speckle observations with the BTA
telescope at the Special Astrophysical Observatory of the Russian Academy of
Sciences (SAO RAS) and the 2.5-m telescope at the Caucasus Mountain Observatory
(CMO) of the Sternberg Astronomical Institute of the Moscow State University to
confirm their binarity and then to determine the parameters of the revealed
stellar pairs. The binarity of the brightest of these stars, J1158+4239 (GJ
3697), has been confirmed. Four sessions of speckle observations with the BTA
SAO RAS telescope and one session with the 2.5-m CMO telescope have been
carried out in 2015 - 2016. The weighted mean estimates of the pair parameters
are $\rho$=286.5$\pm$1.2 mas and $\theta$=230.24$\pm$0.16$^{\circ}$ at the
epoch B2015.88248. The magnitude difference between the pair stars is $\Delta
m$=0.55$\pm$0.03 (a filter with a central wavelength of 800 nm and a FWHM of
100 nm) and $\Delta m$=0.9$\pm$0.1 (an R filter).
