spas-12_(marching_band)_(girls'_frontline)
A skin for SPAS-12 (girls' frontline) from Girls' Frontline, available only to those who pre-purchased the 2nd volume of the Official Girls' Frontline Artbook, and thus exclusive to the older servers (one of a select few to be such).
Per its name, SPAS is in Italian-themed marching band attire, playing the tuba.