Used pair of water pumps for 1950 and 1951 Mercury.  These have the narrow offset pulleys and high horizontal engine mounts.  They appear to be recently rebuilt, then used.  One turns easy and smooth, the other does not - it turns stiffly.  At minimum they would be good cores.  Housing casting number on right side pump is OCM-8503.  Left pump is after market, but would be Ford casting number OCM-8504 .