The sentence is ambiguous, and can be interpreted in 2 ways: I had seen it in Rome about a week ago, before you bought it. I had seen it in Rome about a week before you bought it .
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Volcano1985Is it correct for grammar?No. ago measures time backwards from the present. had seen (or any past perfect tense) measures time backwards from a point in time in the past. So you have a contradiction. Remove ago and everything will be fine!