This is a NOS vacuum advance unit for the distributor for the years and makes listed below with distributor numbers 1841511 [IBP-4002E] 1841514 [IBP-4002-F & 1842602 [IBP-4003E] . This is a original NOS Mopar part in it’s original packaging.
1879283 [supercedes P/n 1879605]
1958; [see below for specifics]
Saratoga; 1958 UP TO engine #58S-1201 & AFTER engine #58S-1500
New Yorker; 1958 UP TO engine # 58N-1201 & AFTER engine #58N-1350
Coronet; Coronet Custom; Royal; 1958 WITHOUT fuel injection