A Photo would help immensely . Peugeot`s can be difficult as they had different systems of frame numbering over the decades. The most common examples , usually from the 80`s would begin with a B or a Y and the next number indicates the year so ( for example ) if it was stamped B208...... it would be a 1982 manufacture. They also had a sticker on the non drive side chainstay which had the frame size and model number although many buyers took these off or they fell off with age.