Victorian Tunic Identification

[bazsi]

I have an other interesting tunic which needs an identification. The buttons looks like Green Howards buttons. What kind of tunic could it be? Is it a late Victorian period volunteers tunic for Green Howards? There is a crown on the upper left arm, is it a rank insignia (sergeant major) or something else? Something is missing from the shoulder boards, there is stitching on the reverse? Was it the name and number of the battalion?

Thank you for your help.

Balazs