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| R230: Entrance | R231: Firefly in the sea |
| Issue | Tokyo Bay Aqua-Line | |
| Prefectures | Chiba and Kanagawa | |
| Date of Issue | 18 December 1997 (Heisei 9) | |
| Denomination | 80 yen x 2 | |
| Quantity | 1,000,000 se-tenant pairs | |
| Designs | R230: The Ukishima entrance and the ventilating tower in the sea | R231: Umi-hotaru (firefly in the sea) at sunset |
| Image Area | 22.5 x 33.0 mm, vertical | |
| Printing | Offset in 5 colours | |
| Sheet | 20 stamps (4 x 5) | |
| Designer | Shimoda Kouichi | |
| Sold at | Post offices in Kantou, and the regular 13 Central Post Offices | |
| First Day of Issue Postmark | Kisarazu Post Office | |
| Kawasaki Central Post Office | ||
| Issue | Tokyo Bay Aqua-Line, Pane |
| Price | 800 yen (80 yen x 10) |
| Quantity | 360,000 panes |
| Pane Size | 51.0 x 190.0 mm, vertical |
| Sheet | 10 stamps (2 x 5) |
| Catalog No. | R231P |
Japanese Stamp Specialized Catalog (JSCA) & SAKURA Catalog numbers are adopted.