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From targeted observations of ground-state OH masers towards 702 Multibeam(MMB) survey 6.7-GHz methanol masers, between Galactic longitudes 186$^{\circ}$through the Galactic centre to 20$^{\circ}$, made as part of the `MAGMO'project, we present the physical and polarisation properties of the 1720-MHz OHmaser transition, including the identification of Zeeman pairs. We present 10new and 23 previously catalogued 1720-MHz OH maser sources detected towardsstar formation regions. In addition, we also detected 16 1720-MHz OH masersassociated with supernova remnants and two sites of diffuse OH emission.Towards the 33 star formation masers, we identify 44 Zeeman pairs, implyingmagnetic field strengths ranging from $-$11.4 to $+$13.2 mG, and a medianmagnetic field strength of $|B_{LOS}|$ $\sim$ 6 mG. With limited statistics, wepresent the in-situ magnetic field orientation of the masers and the Galacticmagnetic field distribution revealed by the 1720-MHz transition. We alsoexamine the association statistics of 1720-MHz OH SFR masers with otherground-state OH masers, excited-state OH masers, class I and class II methanolmasers and water masers, and compare maser positions with mid-infrared imagesof the parent star forming regions. Of the 33 1720-MHz star formation masers,ten are offset from their central exciting sources, and appear to be associatedwith outflow activity.

MAGMO: Polarimetry of 1720-MHz OH Masers towards Southern Star Forming Regions