Lincoln Service Parts 1 › Lincoln Electric 9SM23774-6 EPOS4 50/5 WITH MOTHER BOARD M23774-6 Lincoln Electric 9SM23774-6 EPOS4 50/5 WITH MOTHER BOARD M23774-6 Sale Price: $1,879.08 Original Price: $2,160.94 EPOS4 50/5 WITH MOTHER BOARD PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! EPOS4 50/5 WITH MOTHER BOARD PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1