In my collection, I found this stamp which is missing many of its perforation on the right side. However, under a magnifying glass it looks different than any of the variants I could find online.


Doboj with overprint
The optional war stamps 1914
Catalog codes:
Mi:AT-BA 89I, Sn:BA B1, Yt:AT-BA 85, Sg:AT-BA 383, ANK:AT-BA 89I, Phi:AT-HU BA 89I, Un:AT-BA PM85
Variants:
Click to see variants
Has minor variants: 6
Themes:
Bridges | Landscapes | Mountains
Issued on:
1914-11-01
Size:
42 x 30 mm
Colors:
Green
Watermark:
No Watermark
Designers:
Koloman Moser
Format:
Stamp
Emission:
Definitive
Perforation:
line12½
Printing:
Recess
Face value:
7 Austro-Hungarian heller
Print run:
100,000

The top line of the overprint has this weird looking reddish ink additions between the 1914. (period mark) and the 2 vertical squares.
In the bottom line, it looks like the first and second "e" are missing most of its bottom; and the "r" is not fully directly under those squares, but slightly to the right