| van Balen Blanken, G. C. (Sonstiges) |
Attest |
NVPH |
2 c |
| Louis, Albert (BPP (Bund Philatelistischer Prüfer)) |
Befund |
NVPH |
2 g |
| Moeijes, W. (Sonstiges) |
Attest |
NVPH |
2; 3 |
| Bakker, Th. C. (Sonstiges) |
Attest |
Scott |
23; 29; 40 - 43 |
| Vleeming, Henk (AIEP (Association internationale des experts en philatélie)) |
Attest |
NVPH |
24 L |
| Muis, C. (Händlergarantien) |
Attest |
NVPH |
25 H |
| Vleeming, Henk (AIEP (Association internationale des experts en philatélie)) |
Attest |
NVPH |
25 H |
| Vleeming, Henk (BPP (Bund Philatelistischer Prüfer)) |
Attest |
NVPH |
3 a I |
