Rob- I started about 6 years ago and I will echo Tim's thoughts about how seldom they come up in groups, I bought almost every one of them individually which is why the cost was a little more than I would have thought.
My last 2 cards were Wood (last one) and Wagner pastel. The Wagners are out there, they are just expensive. The Woods are extremely hard to find. I thought I had a master set until I read Tim's article (thanks Tim
) and found out there are variation backs out there which I didn't know about. The only variations I knew about were the blue/black backs and the HOFer regular/300 series backs.
If you get them in nice shape (and because they were mailed rather than sold with caramels or tobacco they often are sharp) they are great looking.
Great set with tons of scarce cards to make it an adventure in the 300 series backed cards.
tbob