This is a NOS vacuum advance unit for the distributor for the years and makes listed below with distributor number IBS-4101A Chrysler P/n 1842805 & IBS4010 Chrysler P/n 1842811 . This is a original NOS Mopar/Autolite part in it’s original packaging.
1881767 [Autolite P/n 90-45]
Windsor; ALL with high performance with IBS4010 distributor
Chrysler 300E; ALL with IBS4010 distributor
New Yorker; 1959 ALL with IBS4101A distributor
ALL with IBS4101A distributor