15h statistics
The detailed statistical analysis of the 15h is based on the author’s records: 23,372 attributed stamps, of which 8,005 carry a legibly dated cancellation (as of 5 September 2026). The source is the “Stats 15h” and “Usage Stats 15h” sheets of the record workbook.
Perforation distribution
Perforation × plate matrix
The combination of perforation and plate is the basis of 15h specialisation. The table and chart show all 20 documented groups.
| Perforation | Plates 1–2 | Plate 3 | Plate 4 | Plates 5–6 | Plate 7 | Total | % |
|---|---|---|---|---|---|---|---|
| imperforate | 4 526 | – | – | 19 | 112 | 4 657 | 19,9 % |
| A — 13¾:13½ comb | 2 202 | 418 | 331 | 518 | 73 | 3 542 | 15,2 % |
| B — 11¾ comb | 294 | 270 | 489 | 4 960 | – | 6 013 | 25.7 % |
| C — 13¾ line | 29 | – | – | 4 784 | – | 4 813 | 20,6 % |
| D — 11½ line | 1 365 | – | – | – | – | 1 365 | 5,8 % |
| E — 11½:10¾ line | 480 | – | – | – | – | 480 | 2,1 % |
| F — 13¾:11½ line | 2 486 | – | – | – | – | 2 486 | 10,6 % |
| G — 11½:13¾ line | 9 | – | – | – | – | 9 | 0.0 % |
| H — 13¾:10¾ line | 7 | – | – | – | – | 7 | 0.0 % |
| Group sum | 11 398 | 688 | 820 | 10 281 | 185 | 23 372 | 100 % |
The matrix clearly shows the scarcity of perforation A on plates V–VI (518 pieces, i.e. ≈5 % of the material of these plates — against ≈47 % each for B and C), the scarcity of C on plates I–II (29 pieces), and the exclusivity of line perforations D, E and F to the early plates I–II.
Dated cancellations over time (VI 1919 – IV 1921)
Usage peaks in spring 1920 (April–May), when plates 5–6 in perforations B and C dominated.
Development by group
Each group separately. Use the buttons below to choose the perforations and the plates you want to compare — only the groups matching both are drawn. Individual series can also be hidden by clicking the legend.
| Group (perforation · plates) | Dated pieces | Earliest usage | Usage peak |
|---|---|---|---|
| A plates 1–2 | 216 | 2. 8. 1919 | SEP 1919 |
| A plate 3 | 312 | 27. 4. 1920 | APR 1921 |
| A plate 4 | 201 | 5. 6. 1920 | APR 1921 |
| A plates 5–6 | 241 | 25. 3. 1920 | MAY 1920 |
| A plate 7 | 31 | 1. 3. 1920 | MAR 1920 |
| B plates 1–2 | 224 | 30. 12. 1919 | MAR 1920 |
| B plate 3 | 168 | 19. 4. 1920 | MAY 1920 |
| B plate 4 | 327 | 23. 3. 1920 | JUL 1920 |
| B plates 5–6 | 1252 | 8. 2. 1920 | MAY 1920 |
| C plates 1–2 | 20 | 25. 8. 1919 | MAR 1920 |
| C plates 5–6 | 2336 | 1. 2. 1920 | MAY 1920 |
| D plates 1–2 | 1000 | 30. 6. 1919 | OCT 1919 |
| E plates 1–2 | 322 | 28. 7. 1919 | MAR 1920 |
| F plates 1–2 | 845 | 12. 9. 1919 | APR 1920 |
| G plates 1–2 | 5 | 11. 2. 1920 | FEB 1920 |
| H plates 1–2 | 3 | 15. 3. 1920 | MAR 1920 |
| imperf plates 1–2 | 419 | 24. 6. 1919 | DEC 1919 |
| imperf plate 5 | 10 | 28. 5. 1920 | JUN 1920 |
| imperf plate 6 | 9 | 29. 3. 1920 | JUL 1920 |
| imperf plate 7 | 64 | 9. 7. 1919 | SEP 1919 |
| Total | 8005 | 24. 6. 1919 | MAY 1920 |
The sequence of earliest dates nicely documents the production chronology: on plates 1–2 the imperforate sheets and the line perforations follow in quick succession (24 Jun → 30 Jun → 28 Jul 1919 for imperforate, D and E), immediately followed by comb perforation A (2 Aug 1919), then C (25 Aug) and F (12 Sep 1919); B on plates 1–2 appears only at the turn of the year, and from February 1920 plates 3–7 take over.
Perforation B: share of plates I and II
A separate attribution of 413 perforation-B pieces from plates I–II: plate I 105 pieces (25.4 %), plate II 308 pieces (74.6 %) — plate II thus clearly dominates in perforation B.
Perforation shares in collections compared
The differences from the Monograph (e.g. for perforation B) suggest that the historical rarity data for some perforations deserve revision.
My thanks to Johan Sevenhuijsen for sharing the statistics of his collection.