| 09-04 |  |  |  | zh | | eerste leesboekje aap/noot/mies 1931 |
| 09-04 | |  | | dr | | zaandam (1931) |
| 09-04 | | | | ge | € 25 | antieke jaarbeurs poster 1931 |
| 09-04 | |  | | zh | | 5 markkaa munt uit 1931 finland |
| 09-04 | | | | zh | | 20 kopek munt uit 1931 rusland |
| 09-04 | | | | ge | | brochure renault vivasix 6 cylindres 1931 |
| 09-04 | | | | nb | € 6 | ansicht overtoom amsterdam 1931 |
| 09-04 | | | | ge | € 10 | hanöl, valdemar - de zilverschedels (1931) |
| 06-04 | | | | zh | | rotterdam 1931 droogdokken |
| 06-04 | | | | nb | | 1 gulden 1931 |
| 04-04 | | | | fr | | the studio year book 1931 art deco |
| 04-04 | | | | zh | | poetry uit 1931 |
| 04-04 | | | | ge | | dr. jos keulers bijbelsche geschiedenis 1931 |
| 04-04 | | | | zh | | ansichtkaart afsluitdijk uit 1931 |
| 28-03 | |  | | ov | | zilveren cakeprikker, 1931 oud hollands |
| | | | | fr | € 48 | de geheime leer h.p. blavatsky - 2 boeken 1931- 1934 |
| | |  | | gr | € 400 | cmc mercedes-benz ssk herfstprijs argentinië |
| | |  | | zh | | duitsland 'polarfahrt 1931' postfris |
| | | | | nb | | de gilde viert plaatjes album 1931 |
| | | | | nb | € 7 | colijnsplaat 1931 nieuwe pastorie en kerk en mensen |
| | |  | | ge | | chevrolet ae independence coupe 6 cilinder uit 1931 |
| | | | | zh | | de institutie van johannes calvijn uit 1931 |
| | | | | ge | € 3 | 990524\tkatwijk aan zee\t1931 zh plaatfout zegel\t \tgelopen met |
| | | | | | € 530 | 948730\ts gravenhage\tkwartellaan\t1931\t nette oude kaart onbes |
| | | | | | € 3 | 981025\tlunteren\tgld hotel\tde veluwe\t1931\tgelopen met post |
| | | | | | € 3 | 977434\tsoest\tvosseveld\t1931\tgelopen met postzegel |
| | | | | nb | € 35 | metalen cadillac v16 (1931) mooi |
| | | | | | € 20 | braak, menno ter - man tegen man (1931 1e dr.) menno ter - m |
| | | | | | € 10 | stoop-snouck hurgronje, j. - grootjes meiboek (1931) |
| | | | | | € 6 | gezelle, guido - kleengedichtjes (1931) |
| 02-12 |  |  | | | € 35.000 | indian 1931 scout 101 600 cc 2 cyl sv 3504 |
| 09-12 | | | | | | noodhulp (1931) |
| 17-12 | | | | | | 25 gulden mees (1931) |
| 20-12 | | | | | | emilio borsa (1857–1931) - vita contadina |
| 20-12 | | | | | | nicola gambedotti ( 1931-2011) - paesaggio |
| 20-12 | | | | | | pino bonfadini (1931 - 2020) - paesaggio del secondo periodo |
| 25-12 | | | | | € 9.500 | dkw 1931 block 300 293 cc 1 cyl ts 3412 |
| 31-12 | | | | | | w.zolder.opr.t,k 5 poezie albums van af 1931,1970.19711981,1983,en het grote boek |
| 22-12 | | | | | € 19.000 | harley-davidson model r 1931 750cc (bj 1931) |
| 28-12 | | | | | | boeken - rolls-royce & amp; bentley depuis 1931 - bentley |
| 24-12 | | | | | | ruanda-urundi 1931/1941 - volledige verzameling : alle uitgiften over een periode van 10 jaar (eind 1931 t/m 1941) - obp/cob 92/106 t/m 121 |
| 24-12 | | | | | | duitse rijk - baltic sea flight, on-board post 1931 with drop-off in copenhagen - sieger 108 c a |
| 24-12 | | | | | | duitse rijk - 3rd south america flight 1931 friedrichshafen via pernambuco to barcelona - sieger133 aa |
| 24-12 | | | | | | fan ho (1931-2016) - approaching shadow, hong kong 1954 |
| 23-12 | | | | | | fan ho (1931-2016) - street scene, hong kong 1956 |
| 23-12 | | | | | € 37.000 | humber 1931 pullman limousine sedan |
| 23-12 | | | | | | boeken - l'auto italiana. dal n.ro 13 del 10 maggio 1931 al |
| 22-12 | | | | | | alfons borrell palazón (1931-2020) - records de paisatge 4 |
| 22-12 | | | | | | alexandre ier - roi de yougoslavie - belle photographie dédicacée - 1931 |
| 21-12 | | | | | | fan ho (1931-2016) - whitty street diary, hong kong |
| 21-12 | | | | | | fan ho (1931-2016) - crossboat, hong kong 1957 |
| 18-12 | | | | | | fan ho (1931-2016) - as evening hurries by, hong kong 1955 |
| 16-12 | | | | | | boeken - l'auto italiana.dal 10 gennaio 1931 al 30 aprile |
| 16-12 | | | | | | louis erard - regulator - 1931 - heren - 2011-heden |
| 16-12 | | | | | | fan ho (1931-2016) - dream of old hong kong, 1957 |
| 12-12 | | | | | | wespe - 1:8 - bugatti t51 gp 1931, kit model |
| 12-12 | | | | | € 36.000 | ford usa a roadster - 1931 (bj 1931) |
| 08-12 | | | | | | commandant p. pollacchi - atlas colonial français - 1931 |
| 05-12 | | | | | | zweden 1931 - the royal palace in stockholm - k 5 green - on colored paper / on white paper - mnh - michel 215 a/b |
| 03-12 | | | | | | ennio finzi (1931) - scale transcromatiche |
| 01-12 | | | | | | spanje 1931 - montserrat, surface post - edifil nº 636/645+649 |
| 01-12 | | | | | | duitse rijk 1931 - “deutsche nothilfe” (german emergency aid) – “buildings”, mnh - 459-462 mnh |
| 29-12 | | | | | | ennio finzi (1931) - progetto vetro di murano |
| 28-12 | | | | | | andorra 1931 - overprinted merson type stamps of france, 10 f. green and red - yvert 22 |
| 26-12 | | | | | | milan goldschmiedt (1931) - the hostage |
| 26-12 | | | | | | koninkrijk italië 1931 - naval academy complete set, centred and intact - sassone s.60 |
| 26-12 | | | | | | spanje 1931 - alfonso xiii, spanish republic overprint (enabled). - edifil 593hph, 598hph, 600hh+600 |
| 23-12 | | | | | | ricko - 1:18 - lincoln model k - 1931 |
| 19-12 | | | | | | spanje 1931 - montserrat airmail complete set in block of 4 - edifil 650/654 |
| 17-12 | | | | | | baya (1931-1998) - composition |
| 15-12 | | | | | | andorra 1931 - overprinted stamps of france from 1900-1927, ‘blanc’ type series and complete ‘sower’ type - yvert 1 à 18 |
| 13-12 | | | | | | leon daudet - les bacchantes [1/30 ex. sur hollande] - 1931 |
| 10-12 | | | | | | belgië 1931 - blok 3 - prins leopold "korporaal" - cto "exposition club philatelique bruxelles" - obp bl3 |
| 09-12 | | | | | | belgië 1931 - volledige jaargang incl. kepi, verpleegster, korporaal - obp 315/332 |
| 08-12 | | | | | | arthur rimbaud - oeuvres complètes. première édition intégrale - 1931 |
| 08-12 | | | | | | san marino 1931 - postage due, ‘masks’; complete set of 15 values with very good centring. extremely fine - sassone n. 32/46 |
| 05-12 | | | | | | sir isaac newton - opticks or a treatise of the reflections, refractions, inflections & colours of light - 1931 |
| 03-12 | | | | | | spanje 1931 - monastery of montserrat. complete set - edifil 636/49 |
| 01-12 | | | | | | 1931 giacomo borgogno - barolo riserva - 1 fles (0.72l) |
| 01-12 | | | | | | duitse rijk 1931 - combinatie. - michel: wz 5 |
