Malta postage due stamps (tête-bêche)
Malta Post Office (stamp issuer)
Scan of original (from <a rel="nofollow" class="external text" href="https://www.ebay.com/itm/MALTA-1925-SG-D1a-10a-Mounted-Mint-Postage-Due-1-2d-to-1-6-in-Tete-beche-Pairs/264751187028">a 2020 eBay listing</a>)