Engineering Achievements
60%
| Country: | United Kingdom of Great Britain & Northern Ireland |
|---|---|
| Issue: | Llechwedd Slate Caverns |
| Date: | 1983-05-25 |
| Print: | Offset lithography |
| Perforation: | Rouletted 7 |
| Emission: | Private |
| Format: | Se-tenant |
| Face Value: | 2*5 British penny |
| Print run: | 4000 |