4 postcards lot USA mail coaches 19th century 1850s-1860s Richard Blake unposted

This is a lot of four postcards illustrating US mail coaches from the 1850s and 1860s, published by Richard Blake in the UK. They show the following coaches :

• Overland Mail Company Celerity Wagon, 1858
• California State Company Concord Coach, 1853
• Overland Stage Line Concord Coach, 1865
• Central Overland California & Pike's Peak Express Company passenger wagon, 1862

The cards are in fair condition with some wear to the corners and edges, and a few marks.

Also included are two small information sheets about two of the vehicles.