Very neat find. The lugs are almost certainly are stamped, cast lugs didnt start getting produced until the '70's.
Fork blade stiffeners are often added to inside of the fork blade for additional stiffness but they are brazed directly to the forkblade, not actually part of the crown lug. If your bike shows no evidence of a seam between the lug and the spear, then it the spear was part of the lug. It could either be that the lug was originally that big, or else the builder welded an extension onto the lug before brazing the tubes in. The lugs are most likely regular high carbon steel and the extension can be high-temp welded together rather than bazed together. By grinding and sanding the weld, there may be little evidence of the weld left afterwords.

Note how your saddle attaches forward of the seatpost. Using this seatpost design of the time, it was necessary to use a shallow seat tube angle to get the saddle in same place that would be achieved by a modern rear clamp seatpost and a steeper seat tube angle.

THe symbols and cutouts in the lug are not from the original stamping, these would have been added to the lugs after they were pressed by drilling a series of holes close together and then filing to connect and fisnish them. They look very hand produced and give the frame a definite character.