2 pieces of flown material from the Apollo 13 mission, including: 1 by 1 ⅛ inches swatch of nylon material, mounted on yellow card certificate (7 by 5 inches), printed in blue with Apollo 13 emblem, stating "A Piece Of "ODYSSEY" CSM 109", presented to Lawrence J. Cervellino, and SIGNED by the crew. — 1 ⅛ by 1 ½ inches of nylon netting, mounted on yellow card certificate (7 by 5 inches), printed in blue with Apollo 13 emblem, stating "A Piece Of "AQUARIUS" LM-7", presented to Lawrence J. Cervellino, and SIGNED by the crew. 

Two pieces of FLOWN MATERIAL FROM THE APOLLO 13 MISSION, mounted on certificates SIGNED by JIM LOVELL, JACK SWIGERT, and FRED HAISE These certificated bearing pieces of flown material from the Apollo 13 mission were presumably issued shortly after its conclusion.  It would appear they were created and then presented to those involved in the mission as a mark of gratitude.