Mint Never Hinged (MNH) postage stamp as per title and scan below. Issued by the Solomon Islands on 25th September 2015 to commemorate the 70th Anniversary of the Liberation of the Camp by the Soviet Army.

UK 1st Class P&P is £1.35.
Airmail (Europe) is £2.25.
Airmail (Outside Europe) is £2.25.
Any additional individual stamps purchased at the same time are POST FREE (Please use the Shopping Basket on eBay.co.uk for Postage Discounts PLUS Extra Discounts).