The only difference between North Borneo #1 and #10 is the perforation gauge.

1883, North Borneo, Scott #1, Genuine

(1.) Perf 12. (2.) The perfs can not be gauged in the scan, so count the teeth at the top or the bottom. There should be 12 of them. (3.)Exp:do. Ref: Scott catalog.

1886, North Borneo, Scott #10, Genuine

(1.) Perf 14. (2.) The perfs can not be gauged in the scan, so count the teeth at the top or the bottom. There should be 15 of them. (3.) Exp:do. Ref: Scott catalog.