The image shows a set of four postage stamps from Poland, featuring the following dinosaurs:
The stamps were issued in 1965 and are part of a series of stamps depicting prehistoric animals.
The Brontosaurus was a large, long-necked sauropod dinosaur that lived in North America during the Jurassic period. It is one of the most well-known dinosaurs and is often depicted in popular culture.
The Xheorhynchus was a small, bird-like dinosaur that lived in Europe during the Jurassic period. It had a long, slender beak and was likely a carnivore.
The Edaphosaurus was a pelycosaur, a group of reptiles that are related to mammals. It had a large sail on its back that may have been used to regulate body temperature.
The Ichthyostega was an early tetrapod, a group of vertebrates that includes amphibians, reptiles, birds, and mammals. It lived in the Devonian period, about 355 million years ago. It was semi-aquatic and had both lungs and gills.
These stamps are a valuable piece of philatelic history and would be a great addition to any collection.