If it is an "airweight", the frame is made of an aluminum alloy not steel. The barrel and cylinder will be steel. I suspect you are refering to the color, and with no model number on the frame under the crane, then it will be a nickel plated gun. The nickel and blue guns come in both all steel and airwieght versions.
The stainless steel guns, which are similar in color to nickel did not appear until after model numbers were assigned in 1957.
We need more info to narrow down to a specific model.
Does it hold 5 or 6 rounds?
If 6 then it is a "Military & Police Airweight" also refered to as a "pre model 12" although the former would be the correct term.This would be a K frame sized revolver.
If it is a 5 shot then there are more questions. Any of these would be a J frame sized revolver.
Does it have an exposed hammer, either with a spur, or without? This would make it a "Chief's Special Airweight" or a "pre model 37". While to the best of my knowledge these guns all came from the factory with a hammer spur, it is not an uncommon modification to remove it.
Is the hammer only accessable for cocking through a slot in the rear of the frame with the sides of the frame being somewhat higher than normal? This gives the revolver what some describe as a humpback appearance. This would be an "Airweight Bodyguard" or "pre model 38".
Does it have no visible hammer? This would be a "Centennial Airweight" or "pre model 42".
Hope this helps