Exemption regime for central excise permitting reduced duty proportions for initial aggregate clearances under specified eligibility conditions. The notification grants a time limited exemption by allowing specified clearances for home consumption to be charged at reduced proportions of the normal excise duty for prescribed initial aggregate tranches, subject to a written option by new claimants, aggregation of clearances across factories and manufacturers, exclusions for fully exempt clearances and certain in factory uses, non applicability to goods bearing another's brand except limited cases, and detailed valuation and eligibility rules with an annexure listing excluded tariff items.