Let us accept invitation to one of huge Serbia town Subotica, located close to Hungary border.
Subotica has very nice center, many interesting places in centre and other highlights to view.
For searchers :
Cache is located in south suburb, close former factory "Bratstvo", now "Tatravagonka Bratstvo" currently under Slovak management.
X=single digit from interval 0..9, charakteristic for Subotica. Which one ?
Final location :N 46° (X-3).(X+1)(X+2)9' E 19° 41.4(X+2)(X-1)'