The name on the mold is Rock Fly. 4 cavities. 1/8, 1/4, 3/8 and 1/2. Very similar to the walleye head.
Here ya go Marc.... a 3/8 cast on a 1/0 flat eye hook.

The head is weird. Look closely and you can see the head portion tilting downward from the collar and hook shank at about a 10-12 degree angle. Every head is configured that way. The eye pocket for the line tie is only on one side of the mold so the tie is offset a small amount. Everything on this mold is loose....the handles and the hinge/pin. There must have been a cavity-filling issue for someone who owned it prior to me as the gates have been drilled out. At one time I think I had six of this same mold but sold most thru our antique business back when. This was the best one of the lot. Somewhere I have a box with several other vintage Do-It molds, all with red handles....some jig, some sinker and all of the jig molds different from the one shown here.
On a funny note, when we were walking the mall prior to Christmas there were strands of lights hanging from way up yonder and each strand had a lead weight on it. I looked at the weights thinking they looked familiar. Sure enough, the bank sinker, 4 ounce. White powder coated to match the wire color.