This paper is the last in a series investigating low-redshift galaxy systems identified by the matched-filter technique in a moderately deep I - band survey . In this paper we present new redshifts for 747 galaxies in 23 ESO Imaging Survey ( EIS ) cluster fields . We use the “ gap ” -technique to search for significant overdensities in redshift space for identifying groups/clusters of galaxies corresponding to the original EIS matched-filter cluster candidates . In this way we spectroscopically confirm systems in 10 of the 23 cluster candidate fields with a matched-filter estimated redshift z _ { MF } = 0.3 - 0.4 and with spectroscopic redshifts in the range from z = 0.158 to z = 0.534 , with the observations favouring the confirmation of systems at the lower redshift end . After careful analysis of the redshift distribution , one system was split into two very close clumps in redshift space . We find that the systems identified in the present paper span a broad range of velocity dispersion and richness . The measured one-dimensional velocity dispersion range from 175 \mathrm { km / s } to 497 \mathrm { km / s } , consistent with the values obtained in previous papers using much larger samples for systems over the same redshift range . Both undersampling and contamination by substructures contribute to the uncertainty of these measurements . The richness range corresponds to clusters with an estimated total luminosity in the range 12 L ^ { * } < L < 65 L ^ { * } , but these estimates are very uncertain as are their relation to the velocity dispersion ( mass ) of the systems . From the analysis of the colours of the galaxy populations we find that \sim 60 % of the spectroscopically confirmed systems have a “ significant ” red sequence . We find that the colour of the red sequence galaxies matches passive stellar evolution predictions . With this paper we complete our spectroscopic survey of the fields of 58 EIS cluster candidates with estimated redshifts z \leq 0.4 . We have measured a total of 1954 galaxy redshifts in the range z = 0.0065 to z = 0.6706 . Of the 58 systems we confirm 42 ( \sim 75 % ) with redshifts between z = 0.095 and z = 0.534 .