Morlaix is a historic small town in Brittany, illustrated in many of Andrieu's cards. There are several cards related to fishing at Peumarch, which is now named Penmarc'h, one is below. Incidentally this card reflects the postal authorities' view that the address side is the "front" of a postcard.
The logo with what looks like a flower containing five Cs is generally regarded as his, though it only appears on some of his cards - maybe this is by date. However the ampersand in the logo indicates that the initials stand for something.
