Is having a 1976 2 dollar bill stamped by the post office and stamps applied defacing the bill does it decrease the value? They were stamped on the day they were issued.

ROBERTLUMLEY- for the first question - For this STAMPING THEM fIRST DAY ISSUE, no it does not ;;. ;;{ NOTE}- NOW I need some more information on the $2.00 BILL
#1- complete date and letter EXAMPLE- 1976;;1976A, ;; 1976B etc. etc. #2- SIGNATURES ,#3-ON the left end inside the large circle will be a letter from (A - 1 ) to and including the last letter which is ( L -12) { example- B-2 C-3 D-4 ;E-5 etc etc
WAITING YOUR REPLY ::have a great night and va better day tomorrow ;; F.B.E.