display block

Selling two aluminum POP cars holders. One appears to be a newer variant and is hollowed out underneath. $30 + shipping for both. CONUS only. PayPal G&S .

Does anyone know the history of the AD display block generations? Photo from Left to Right ~? (Plastic) ~AD Holder 1.0 (Metal) ~AD Holder 2.0 (Plastic) ~AD Holder 3.0? (Acrylic) I keep seeing the left most "simple non-branded black plastic holders" when searching for old small Pop Cards. Were...