Maybe some sort of micro-printing with invisible ink...probably expensive though...
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Successful B/S/T deals with asoriano, obcbobd, x2dRich2000, eyecollectvintage, RepublicaninMass, Kwikford, Oneofthree67, jfkheat, scottglevy, whitehse, GoldenAge50s, Peter Spaeth, Northviewcats, megalimey, BenitoMcNamara, Edwolf1963, mightyq, sidepocket, darwinbulldog, jasonc, jessejames, sb1, rjackson44, bobbyw8469, quinnsryche, Carter08, philliesfan and ALBB, Buythatcard and JimmyC so far.
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