All custom iron sets have serial numbers on all clubs. The same number...

If bought at for example, Golfsmith, then only the 6 iron.

I was concerned as well as I bought a set that had custom shaft on ebay. 

I got the 910H and they should have a holographic…

I checked with a local pro shop and they agreed that the cost involved is a little high for the condition described. I counter offered $50.

items needed: new headcover, new grip, new paint job= $125-175. Not sure that makes much sense when you could…

The golf ball for a lot of players wont make a big difference,, I see golfers playing with range balls. The serious golfer does find his preference. I see low and high handicappers  with the competitions and with Titleist. I have taken a dozen new balls…

I feel the bigest difference is that the 910 is much more forgiving and the ball is much hotter off the face and has a better sound at impact. I feel also that if you do miss, it is not as drastic as the 909 was.