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The eye frequently overlooks a Mk 1 Corribee as although the hull is similar to later boats, the topsides are very different. The side decks are virtually non-existent, the coach roof much wider and there is consequently much more room below. There is more woodwork in the cockpit area and the lazarette has a circular hatch cover. Many owners of later boats have been embarrassed by the performance of the Mk1; it is quite slippery. Sadly this model is not in great demand and it's market value is generally lower than the Mk2 & 3.
Mk 1s that come on to the market (there are not that many) are usually fin keeled and are often a bit scruffy but can be very rewarding to own and sail.

There is some confusion as to the dividing line between the Mk2 and Mk3; these notes follow the naming originally used by Newbridge boats.
The Mk 2 is for many people the Corribee. It can be found in both fin and bilge keeled form and with standard or tall mast rig. Most are bilge keeled and standard rigged; tall mast boats are usually (but not always) fin keeled.
There are also a few junk rigged Corribees, these are not very numerous and should not be confused with the Coromandel which is a derivative with a Corribee hull but different topsides to support the unstayed junk rigged mast.
The early Mk 2 bilge keeler has symmetrical keels (see asymmetric keels below) and there is no anchor well. These boats were made between the mid 1970s and about 1980. Age can often be roughly judged by the rig; many of the earlier boats of this type had roller reefing to the mainsail, later boats usually have slab reefed mainsails. Below the waterline many earlier boats have no skeg, later boats usually have a full skeg. Sail numbers are not an infallible guide but all these boats are likely to have a sail number under 500. A very accurate judgement of the age of a Mk 2 can be made if the hull moulding number can be found; if present this will be at the top of the transom on the port side: the first two digits of the 4 or 5 digit number represent the year of moulding.
Unfortunately we do not have brochures available for Mk 1 and early Mk 2 boats. This is a pity as the early Mk 2 is the model most commonly encountered. However, the scantlings shown below for the late Mk 2/3 also apply generally to the early Mk 2 with the exception of the cabin headroom which was a mere 4 feet 2 inches on early boats.

To the casual observer there is little difference between the early and late Mk 2s and Mk 3. The illustration here is from the brochure prepared for the 1983 boat show and the boat is a Mk 3.
The late Mk 2/Mk 3 has a slightly altered deck with an increased rake to the side decks in way of the cockpit - this eliminates the standing puddle to be found on earlier boats. The lazarette hatch is wider and there is an anchor locker on the fore deck. Below the waterline there is a lot of difference; the hallmark of these later boats is the asymmetric bilge keel (there seem to be very few fin keeled late Mk 2s & 3s). The asymmetric keel is of aerofoil section (shaped like an aeroplane wing) and the intention is to increase lift to windward. It is difficult to judge the efficacy of this arrangement as the hull moulding is also deeper than earlier boats and there is significantly more head room inside. This is a great advantage but the increased wetted area of the hull probably cancels out the gain from the asymmetric keels. The skeg on these boats is abbreviated compared with the earlier full skeg but this does not seem to have any ill effect on directional stability. Just to confuse the issue there are a number of hybrids where early or late hulls have been mated to late or early topsides, we occasionally find a Corribee which has us scratching our heads.