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Specializing in the older cards means I have to know what SHADOWLESS Pokemon cards are because this refers to cards from the very first run of the original Base Set. Below is a picture of a 1st edition Shadowless Charizard(Far left), an unlimited Shadowless Charizard(Middle), and an unlimited Shadowed or Regular Charizard(Far right)
The main differences in the two cards on the left and the much more common card on the far right will be listed below.
1. The SHADOW!
2. The DATES
If the "shadow" does not convince you there is a difference, then the dating should. The card up top has "1995, 96, 98 ... 1999 Wizards". This is the regular Shadowed version. The card below is a Shadowless card and notice that WOTC accidentally put 99 in there a second time. "1995, 96, 98, 99 ... 1999 Wizards." This dating difference is essential for collectors constructing sets! Can you guess why? Within the base set are trainers and energies that do not have pictures as described in the first point! The copyright dating along the bottom is the only obvious way to tell them apart. This dating makes is essentially possible to have without a doubt a 100% Shadowless and a 100% Shadowed base set.
3. The Font
During the transition after the first print run, WOTC also cleaned up their printing color and font. Many of the Shadowless cards have a lighter color background as well as a thin font texture. Compare the "100 HP" on each Venusaur. You can even notice that the "1" has a lip in the Shadowed version on top, while the Venusaur below does not. In the second picture, the two colorless energies symbols are way off center for the Lure attack. This was a major problem throughout the Shadowless print and is uniform on the cards until it was corrected in the following Shadowed print run.
The EXCEPTION:
So hopefully this guide clear everything about Shadowless cards up that you would ever need or want to know! If not please ask and I can always add more information.