Welcome, great looking Penguin! Don't hesitate to ask any questions here, the guy's here are always willing to help out with support and knowledge.
Look for the Hull ID# on the outside of the transom, just to the right of the transom wood. It will be stamped in the aluminum and should start with an "A" for the Penguin model. The last two digits will signify the model year. I believe that you have either a '54 or '55 by the bow handle. The earlier models had a single cast nose piece that came around the front of the bow, not on top.
Great boat, these Penguin's have a special place with the members here.