Vintage Washburn Mandolin Restoration: Stamp Inside the Mandolin By WP-Admin FVL | Published 30. October 2013 | Full size is 1936 × 2592 pixels Washburn Mandolin Restoration: Damage Assessment Vintage Washburn Mandolin Restoration: Serial Numbers Stamp Inside the Mandolin This stamp is barely legible. More information will be posted here when it becomes available. Bookmark the permalink.