The Untold Story/Perfecxion X is a good pairing!
My view - the Partagas Lusitania is normally about $10-15, depending on where you pick them up. So - I'd say under normal circumstances it would be somewhat lopsided. However - because the Lusi has 10 years age on it, and it is somewhat of a "desired" cigar - I think you're in the ballpark for a 40th Anny.
I personally think it's a good trade. I leave it up to the others in the pass for their opinions.
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