- On postcard: POSTOJNSKA JAMA
- Country: Republic of Slovenia
- Number: 4520 // SLO – 112 //
- Postmark: unused
Tag Archives: Postojnska jama
#4491-SI-111
- On postcard: POSTOJNSKA JAMA
- Country: Republic of Slovenia
- Number: 4491 // SLO – 111 //
- Postmark: unused
#4461-SI-110
- On postcard: POSTOJNSKA JAMA
- Country: Republic of Slovenia
- Number: 4461 // SLO – 110 //
- Postmark: unused
#4420-SI-109
- On postcard: POSTOJNSKA JAMA
- Country: Republic of Slovenia
- Number: 4420 // SLO – 109 //
- Postmark: unused
#4388-SI-108
- On postcard: POSTOJNSKA JAMA
- Country: Republic of Slovenia
- Number: 4388 // SLO – 108 //
- Postmark: 6230 POSTOJNA / 29.09.2023.