The only downside is that Pyrex dishes are not marked for microwave use so it is questionable. However, plastic containers are questionable too. Check out Pyrex Love FAQ for more info on Pyrex use. Pyrex Love is a great reference for Pyrex patterns and history.
My second find is a beautiful cast iron saucepan. At first I thought it was Le Creuset. The lid says Made in France and the color looks like the vintage flame orange. The lid says P14 and the bottom of the pan says 14. The bottom of the pan is not flat but has grill pan surface (not on the inside like the Le Creuset grill pans but underneath where the flame touches). Any idea on the history of this lovely, vintage piece?