Refers to Mortgage Backed Securities (M.B.S.s) that at the time of issuance were collateralized by seasoned loans originated prior to the MBS pool issue date.
DELAYED ISSUANCE POOL
Meaning of DELAYED ISSUANCE POOL in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012