The British and Canadians issued similar dog tags during WW2. They were made of a fibre material, a set consisted of two round orange ones with one hole each and an octagonal brownish-green one.
One of the orange nes was attached to the respirator bag to identify to whom each respirator belonged.
The green one was attached to either a cotton string or a privately purchased chain and worn around the neck. Attached to it was the second orange dog tag (hence the two holes on the green one). All dog tags carried the same information, name, Army number, religious affiliation. AFAIK the blood group was only added post war.
If the soldier got killed, the green tag would stay with the body and the orange tag would be forwarded to graves registration, together with the necessary forms giving the location of the grave, cause of death etc…
The Russians used a little bakelite tube worn in the coat or jacket pocket, which contained a piece of paper with the necessary information. Still, the only way how the families could find ourt what happened to a soldier was through the communist party for their members, else the soldiers were just buried and forgotten. Because of this most Russian soldiers joined the communist party. There was no official graves registration of the military, it was left to the party.
Jan