The Corsa 01 is a later Merckx (end nineties) and they all had the "EM" stamp back then, even the cheapest Strada. I don't think this one is Corsa 01.
The "team Hitachi" shouldn't be in this row as I guess it is a former team bike (think 1988 as from 1989 they used Corsa Extra with internal brake cable and in 1987 Team Hitachi used Rossin bikes). I think it's a team bike because it's made from Reynolds tubing and has the cable guides on a very merckx unlike place. My guess it's a bike for the stage races: mechanics preferred external brake cables as it was easier to change. Sometimes -eg after a stage in very bad weather- all the team riders' bikes had to be changed and back then teams didn't have more mecs than racers as they have now. And only the team leader and his first lieutenant had more than one bike.
The Corsa 01 is a later Merckx (end nineties) and they all had the "EM" stamp back then, even the cheapest Strada. I don't think this one is Corsa 01.
The "team Hitachi" shouldn't be in this row as I guess it is a former team bike (think 1988 as from 1989 they used Corsa Extra with internal brake cable and in 1987 Team Hitachi used Rossin bikes). I think it's a team bike because it's made from Reynolds tubing and has the cable guides on a very merckx unlike place. My guess it's a bike for the stage races: mechanics preferred external brake cables as it was easier to change. Sometimes -eg after a stage in very bad weather- all the team riders' bikes had to be changed and back then teams didn't have more mecs than racers as they have now. And only the team leader and his first lieutenant had more than one bike.
About the yellow one: this catalog might help
http://www.velo-pages.com/main.php?g2_itemId=28677