I tried
Hey Steve, please don't think for a moment that I was having a go. You got a lot further than I did.
I can only say conclusively that the boat had a Caribbean sticker on the aft end, either side. I could just make it out, faded into the gelcoat.
I'm really impressed with the Ambassador - In fact I went looking for one last night, but nothing for sale ATM.
My old boat, I was informed, was an early Crest Cutter, but I was never 100% convinced, however I just had a close look at the Crest Cutter ad you posted and it states that it is the MK4 version.
I dare to say that perhaps my old boat was indeed a Mk1...