Tiny dark blue creamer

This is another of my Mother's pieces. Someone was over who knows a little and told me it was unusual to see a piece of glass this dark of blue and called in cobalt blue. However, when I was visiting an antique/vintage shop all cobalt blue glass they had was much paler. No idea how old or where it came from. Item is much darken than it appears in photograph - I had light on them to show detail.