I picked these up a while ago and finally got around to cleaning them. Pretty sure the left one is a Pittsburg piece {MLOD}, I think the pony with the attractive glaze might be also (also seems to have a MLOD) but I'm not exactly sure which style it is (2 3/8 x 3 1/8), and I cannot identify the mark on the 297 but it has an unglazed pinhole.