Thanks for your answers guys, and sorry for the crappy pics but a lousy camera and no photo skills is not a good combination so this is the best i can do.
To DiverDown: You say the watch is full of A M parts without no further explanation so i would like to hear what's wrong.
I'm not surprised about the bezel insert is a AM but i hope the bezel is original ( see crappy pics), the dial has beveled edges on D/D window and the text at the bottom is faded but i can see 704 L with a loupe, the water resist text has an almost faded yellow/greyish color, and yes the serial number starts with a 5.
Regards.