un select puede tener dos valores?

[rrufo]

pues no me funciona:
me da el valor undefined
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<select name="VehiculosP"
onchange="
this.form.camion.value =this.form.VehiculosP.value;
this.form.Companya.value = this.form.VehiculosP.value2">

<option value="1" value2="Uno" </option>