The Courier was offered in .22LR and .32 New Police/.32 S&W.
It had a 3" barrel and was apparently offered only in bright blue. It had an aluminum frame, and the same short grip frame the Agent had.
3,053 were made from 1953 to 1956, with the .22LR model having a 10% premium.
It wasn't a wildly popular gun, especially in the .32 model.
Like all Colt DA revolvers, it was a top quality firearm, and is a collectible Colt today. One in 95% condition would be worth at least $750.00