Sterling Son In Service Pin with Immaculate Heart of Mary Medal

Here is an unusual Son In the Service pin I found this weekend at a local show. This sterling pin is 5/8" long with an Immaculate heart Of Mary medal on a blue enamel cross and a single blue enamel star. I've never seen one like this, though I know there were endless varieties made. Has anyone else come across this variation?
As I was putting this in the display box I realized I only had 2 pics on this post, so I added one of a part of my Sweetheart, Etc. collection