St. Helena postage stamp year 1864/80 Queen Victoria 1 Shilling
That is a classic, high-value denomination from the early issues of St. Helena.
The stamp you are referencing is the St. Helena 1864 1 Shilling (1/-) Yellow-Green, Queen Victoria issue.
Since the 1s value was created by overprinting the older 6 Pence stamp (which was also green), this stamp is known in the Stanley Gibbons catalogue as:
St. Helena 1/- on 6d Green (or Yellow-Green), Stanley Gibbons (SG) number 17 (or similar varieties).
It is a key stamp because the same value was issued under different watermarks and perforations. For the 1864 issue, the key details are:
🇸🇭 St. Helena SG 17 Details and Value Estimate
| Feature | Description |
| Country | St. Helena (British Colony) |
| Issue Period | 1864-1880 (High-Value Overprint) |
| Denomination | 1 Shilling (1/-) |
| Original Denomination | Overprinted on the 6 Pence (6d) stamp |
| Color | Yellow-Green or Deep Yellow-Green |
| Watermark | Crown CC (Crown over the initials ‘CC’ for Crown Colony) |
| Perforation | Typically $12\frac{1}{2}$ |
| Catalogue Number | SG 17 (Standard 1/- on 6d) |
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