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Hen 3-160 is reported in Belczynski et al.'s (2000) catalog as a symbioticbinary system with M7 giant donor. Using $V$- and $I$-band photometry collectedover 20 years we have found that the giant is a Mira variable pulsating with242.5-day period. The period-luminosity relation locates Hen 3-160 at thedistance of about 9.4 kpc, and its Galactic coordinates ($l=267.7^{\circ}$,$b=-7.9^{\circ}$) place it $\sim$1.3 kpc above the disc. This position combinedwith relatively high proper motions (pm$_{\rm{RA}}=-1.5$ mas yr$^{-1}$,pm$_{\rm{DEC}}=+2.9$ mas yr$^{-1}$, Gaia DR2) indicates that Hen 3-160 has tobe a Galactic extended thick-disc object. Our red optical and infrared spectrashow the presence of ZrO and YO molecular bands that appear relatively strongcompared to the TiO bands. Here we propose that the giant in this system isintrinsic S star, enriched in products of slow neutron capture processesoccurring in its interior during an AGB phase which would make Hen 3-160 thefirst symbiotic system with Mira variable S star.

Hen 3-160 - the first symbiotic binary with Mira variable S star