Extremely clean registered commercial banking cover sent from AKUREYRI to Copenhagen in 1925, franked with a brown 20 aur as well as 30 aur Christian X stamps of the first issue.
Commercial cover from a Reykjavik wholesale firm to a Steel Works Company in Germany franked with an unusual combination of 3, 7 and 25 aur Parliament Millenary stamps making up the correct 35 aur rate.
Cover sent as a ship letter to England franked with a single franking of a 35 aur Parliament Millenary stamp. The stamp first cancelled in transit upon arrival in Danish port with a Copenhagen machine cancel which is scarcely seen on Icelandic mail.
Airmail cover sent from Reykjavik to Seydisfjördur, franked with two 15 aur Parliament Millenary airmail stamps. Arrival cancelled in Seydisfjördur 10.VII.30.
Pre-printed cheque from Landsbanki Íslands, Reykjavík. The check is issued by Fiskveiðihlutafélagið Hængur in 1937. A 10 aur postage stamp has been affixed to the check, as was allowed instead of using a specially printed Greidslumerki fee stamp. The stamp then cancelled with the office hand stamp of the entity issuing the cheque. Cheques or invoices/receipts with such usages of stamps instead of Greidslumerki are scarcely seen. For reasons probably not easily proven, the former applies especially to those where the postage stamp has actually been cancelled (either by manuscript or hand stamp). My suspicions lean towards it being so that used postage stamps were often removed from such documents due to their (even if only miniscule) value, while unused stamps without gum were closer to being worthless. This stamp duty was charged on checks and invoices/receipts over 20 Icelandic krónur in value during the years 1935-1941. More details on this can be read in Þór Þorstein's book on Icelandic revenues and theis usages available in .pdf format on the website of the Icelandic Philatelic Federation: https://www.postsaga.is/is/baekur/thor-thorsteins/gjalda-og-sofnunarmerki-auk-stimpla-a-islandi
Double rate inland cover franked with eight copies of 5 aur Jochumsson, cancelled with the well known University machine slogan cancel used in Reykjavik during this period.