| LEGEND | Bid Sheet (English) | Ordre d'achat (Français) | 
| Lot No | Type | Description | Reserve | Estimate | 
| 19168 | FDC | 
 
FRANCE (1952) Poincaré.   FDC with cachet and thematic cancel . Scott No B270, Yvert No 933.
 | $15 | $20 | 
| 19169 | FDC | 
 
GERMANY (1955) Gauss.   Unaddressed FDC with cachet and First Day cancel.  Scott No 725.
 | $10 | $10 | 
| Lot No | Type | Description | Reserve | Estimate | 
| 18470 | FDC | 
 
(Image b)
SWITZERLAND (1957) Butterflies.  Insects.  Leonhard Euler.   Unaddressed FDC with cachet and thematic cancel plus official post office booklet containing the stamps. Scott Nos B267-71. Yverts No 597-601.
 | $15 | $20 | 
| 18699 | ESS | 
 
RWANDA (1965) Quill.  Retort.  Radical.  Books.   Set of 4 trail color proofs (missing value). Scott No 84. Rwanda University.
 | $40 | $50 | 
| 19299 | FDC | 
 
HUNGARY (1977) Newton.  Double convex lens.   Registered FDC with cachet and thematic cancel.  Scott No 2485. Full sheetlet of imperforates.
 | $25 | $30 | 
| 19360 | FDC | 
 
FRANCE (1937) Descartes.   Unaddressed FDC. Includes both varieties of the stamp - Discours de la Méthode, and Discours sur la Méthode. Scott Nos 330-1.
 | $20 | $25 | 
| 19514 | EP | 
 
GERMANY (1964) Hexagons. Circles.  Archive photo (See Note)  of unaccepted design for 80th meeting of German Catholics.  Scott No 896, Yvert No 309.
 | $60 | $75 | 
| 19562 | ND | 
 
BELGIUM (1974) Adolphe Quetelet.  Imperforate.  Scott No 885, Yvert No 1738.   Belgian astronomer, mathematician, statistician and sociologist.
 | $10 | $10 |