I love all my cast iron cook ware, including some from the 1940s from Grandma.
Now that you have cleaned it up and seasoned it, start cooking in it — that’s the best way to keep seasoning it. Especially meats such as bacon and hamburger.
I clean mine lightly by hand and re-season with Crisco as needed.
I have a couple chuck steaks in my fridge that are just callin me...
Cook me! Cook me! Cook me!
They have some nice veins of fat running through them... should be perfect!