i've got this by my father this autumn. sorry for the picture, i hope it helps anyway. i saw someone ahd the same question in 2005
ref. 132004 on the case, No 4/500
front a. lange & söhne glashütte I/SA
made in germany, Doppelfederhaus
furthermore there is sth engraved like "càrmule & söhne" on the back
here the picture:

it has a croc leather wrist in in dark bordeaux/grenadine and it seems to be a left-handed watch, the wheel is on the left side
kind regards