A friend used to have one which he sold circa 1994. As was the norm with Colvics, the hull was moulded by Colvic for fitting out at the owner's whim - some were completed to a high standard, some less so. From memory, the Colvic 30 looks like the 28 and all the ones I'm aware of have bilge keels. Not the fastest things afloat, but pretty stiff and dependable. As with all privately completed boats, take each one on its merits and be prepared to look at a few poor ones in order to find the occasional gem.
I don't see any mention of a Countess 30 in the history book sponsored by the owners association, nor any listed among the member boats. There was a Countess 35, which was a 33 with extended transom. It may be the case this is a 28 with a transom extension, or a typo. Tony Kerry on the Countess owners website is knowledgeable and may be able to help.
Agree the Countesses are not the swiftest in light airs but do get moving (and are steady) in a blow. Their biggest virtues are a robust hull, lots of interior space, and in many cases were fitted with a pretty grunty motor. As noted earlier some of the home finishing can be unusual or poor. I have a 33' and am very pleased with her.
Mmmm.... You might have a point on the name. It was certainly a Colvic, he told me it was 30ft and I know it looked like a Countess 28 /forums/images/graemlins/confused.gif Does Colvic 30 Sailor (or Sailor 30?) ring any bells? Notwithstanding the name, assuming we are talking about the same boat, my previous comments hold good.
no colvic countess 30 exists, it might have been a colvic sailor which came in 26 ft and 29ft6ins, it's difference is that it has a different transom and produced earlier(up to 1980, i think, but dont quote me),than the countess series of yachts (28ft, 33 ft, 35ft and 37 ft).
scan the yacht brokerages, you should be able to see the different types and see which is yours...