We present a comprehensive UBVRI and Washington CT _ { 1 } T _ { 2 } photometric analysis of seven catalogued open clusters , namely : Ruprecht 3 , 9 , 37 , 74 , 150 , ESO 324-15 and 436-2 .
The multi-band photometric data sets in combination with 2MASS photometry and Gaia astrometry for the brighter stars were used to estimate their structural parameters and fundamental astrophysical properties .
We found that Ruprecht 3 and ESO 436-2 do not show self-consistent evidence of being physical systems .
The remained studied objects are open clusters of intermediate-age ( 9.0 \leq log ( t yr ^ { -1 } ) \leq 9.6 ) , of relatively small size ( r _ { cls } \sim 0.4 - 1.3 pc ) and placed between 0.6 and 2.9 kpc from the Sun .
We analized the relationships between core , half-mass , tidal and Jacoby radii as well as half-mass relaxation times to conclude that the studied clusters are in an evolved dynamical stage .
The total cluster masses obtained by summing those of the observed cluster stars resulted to be \sim 10-15 per cent of the masses of open clusters of similar age located closer than 2 kpc from the Sun .
We found that cluster stars occupy volumes as large as those for tidally filled clusters .