Purchased this (pre 1964) Record 043 back in April 2010. Supplied by the manufacturer with 3 blade widths, 1/8, 3/16, & 1/4".
Its primary function is for cutting grooves. Can be worked against the grain. Not ideal for cross grain dado's. Best used with a fine set below the bottom line of the skate. As with most Plough Planes, your start at the forward end of the board, and work your way back as you deepen the cut.
Stewie;