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This is a 2010 Marlen “Prosperity” XXIc Special Edition BF in Black with Sterling Silver trim and overlay. Overlay design is what looks like (hand-engraved?) “Wheat Stalks.” 18K broad nib. New-old-stock. Mint in box with papers and outer box. I found no information about an XXIa and it appears the XXIb has a roller-ball clip and a faceted barrel overlay. The date is an approximation. UPDATE: SOLD. Item #42 in Catalog #85.