Saturday Evening Scout Post Boy Scout Service Stars

Service pins are awarded for each year of service in the scouts. There is a different backing color for each branch of the scouts. Cub Scouts have what is called a gold backing, looks more yellow to me, and Boy Scouts have a green backing. These are not large. The backing piece is about a half inch.
Starting off are a 4 and 5 year pin from a Scoutmaster's uniform. Adults can earn service pins too as long as they are involved with scouting.
Next a pair of three year pins. Current rules allow a scout to wear one pin for the years spent in Cub Scouts and one for each year spent in Boy Scouts. This Scout would have 3 years in each.
#3 is an pin taken apart. There are three pieces. Aside from the backing all parts are the same.
Last are the 1 year pins. It used to be a plain star. At some point it was replaced with a star with the number 1 in the center. I would take a wild guess that the switch occurred in the 1970s. I shall research that further.