I have bought recently in France a wonderful cedar ribs canoe built by Peterborough. This boat is 16 feet length and seems to corresponds to model number 4 or 24 in the reprint catalog. It has also a serial number, and it is the aim of my message to know when this canoe was built. The serial number engraved on the forward deck is: 3157 23 . A characteristic is also that only one thwart is installed, no place for an other one. I join some photographs to ease the identification. I have also seen that exactely the same canoe model was offered to Queen Elisabeth by Peterborough (a long time ago). Thanks in advance for your help.