PeterCDE
10167
Yes and it even does have it?s own reference!
49915, while the regular "John Harrison" is 49910.
Here is the original introduction as of February 2005; like with previous editions, these l.e. "GP Club" units are exclusively available in Italy (but sold out).
The main differences are the steel case (the only "John Harrison" in full steel) and the dial; personally i find it very nicely done!
On the other hand, it might point at a specific practice by GP i?m not exactly happy with.
As seen with the USA-76, there?s a magnitude of different models and editions. For me, there are far too many models and instead of reducing the portfolio to a number that allows a basic overview (and communicate each remaining variant thoroughly), the current number of different variants for the various basic models leads to more than 1.000 different watches. I find this a huge number for such a small brand. Frankly, most of them are not that different from regular models and each new limited edition takes a bit away from the previous ones. A limited edition by Girard-Perregaux thus is not as special as a l.e. by f.e. Patek Philippe and given the large edition runs for many of GP?s l.e., it doesn?t help to create something really collectible.
The 49915 "GP Club" John Harrison is a nice exception in that it?s a case and dial which does set it apart from the regular models in the Sea Hawk range. In this it keeps up with the "T" and the "GP Club" editions of the WW.TC in steel, which are nicely done, became a bit sought after and turned out to be appreciated by the markets.
On a side note, i find the idea of a "GP Club" a very nice one!
Girard-Perregaux is particularly famed in Italy, which remains to be one of the most important markets for the brands. This may explain why it?s limited to that region. Lucky italians 
Greetings from germany,
Peter