CLEAN : Summer sales in luxury auction houses

The transcript discusses the anticipated interest from global collectors in a painting suitable for museum-quality collections. It highlights the excitement for upcoming Sotheby's auctions featuring high-quality materials from private collections not seen for decades. The auctions present a varied sale with a range of objects from 1864 to 1984, including a significant Henry Moore sculpture. The estimated values for the bronze and plaster artworks are also mentioned.

How does the speaker describe the opportunity for collectors in the upcoming auction?

What are the estimated values of the bronze and plaster pieces mentioned?