Machined copper castings lost exemption under the restricted notification, but demand failed for absence of suppression and limitation.

Machined cast copper articles were outside the later exemption because the benefit was restricted to sub-heading 7419.91, and proof machining moved the goods to sub-heading 7419.99. The earlier general exemption for cast copper articles did not extend to machined castings under the amended notification, so the exemption failed on merits. However, limitation barred the demand and penalty because the department had already examined the process, knew of the machining activity, and there was a longstanding classification dispute. In that setting, omission to mention machining in classification lists was not suppression of facts, making the demand time-barred and the penalty unsustainable.

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Issues: (i) Whether machined cast copper articles continued to be covered by the exemption notification after the later notification restricted the benefit to sub-heading 7419.91; and (ii) whether the demand and penalty were barred by limitation in the absence of suppression.

Issue (i): Whether machined cast copper articles continued to be covered by the exemption notification after the later notification restricted the benefit to sub-heading 7419.91.

Analysis: The earlier notification exempted cast articles of copper by general description, so the benefit was available so long as the goods remained within that description. The later notification made the exemption restrictive by limiting it to sub-heading 7419.91. Once the castings were subjected to proof machining, they fell under sub-heading 7419.99 and ceased to be covered by the later notification.

Conclusion: The exemption was not available to the machined castings under the later notification; this issue was against the assessee.

Issue (ii): Whether the demand and penalty were barred by limitation in the absence of suppression.

Analysis: The record showed a long-standing dispute between the assessee and the department regarding the classification of machined copper castings. The department had earlier examined the process and the samples and was aware of the machining activity. In that background, non-disclosure of machining in the classification lists could not amount to suppression of facts. The charge of suppression therefore failed, with the result that the demand was time-barred and the penalty could not stand.

Conclusion: The demand was barred by limitation and the penalty was unsustainable; this issue was in favour of the assessee.

Final Conclusion: Though the exemption was not available on merits for machined castings under the restricted notification, the demand and penalty could not be sustained because the department had prior knowledge and suppression was not established.

Ratio Decidendi: Where the department already knows the relevant manufacturing process and classification controversy, mere non-mention of that process in classification lists does not constitute suppression of facts for limitation purposes.

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