Just before the convention last June, the California was issuing some of its old yellow front cards as they ran out of the "Player's Gold" ones they have been using for years. When I was there at that time, they were issuing the "Player's Gold" cards again, but there were copies of the yellow type four (Faraday mfg mark and no black box on the back) cards laying around in nearly unused shape. I picked up some for future trading, but this didn't excite me that much as I have a type four that was issued to me many years ago in my collection. When I got downtown last week, I found they were again digging out old stock to use, as they were issuing yellow type three (Faraday mfg mark and a black box on the back) cards and I did not have one of those. Got it and extras now. In examining the two types, I see the reason for the black box in the hole-punch area. These cards work by light shining through the holes, and Scott at Able Card Corp. once told a story of some cards at Lady Luck. The Lady Luck cards all consisted of two layers of white plastic with a layer of black plastic inbetween to block the light in the "non-hole" places. But the card manufacturer had some white plastic they thought was opaque enough, and they had one run of cards that was pure white without a black layer. These California cards are using a similar principle. The type four cards have a black layer in the plastic, the type three's don't. So, the type three's (and also the no mfg mark type type two, I suspect, but I don't have types one and two) had the black box printed on the back to block the light on the cards without the black plastic layer.