Australia: block of 2 shilling stamps with flannel flowers (1959-63), Stanley Gibbons 323a, a rare variety in which the T of Australia is slightly thinner (so called T retouch). The stamp is on toned paper as opposed to the white paper of the normal version. A normal (cancelled) version of the stamp is included to see the difference. A photo of a normal mint stamp is also shown (but the latter is not included in the price). The block consists of 7 cancelled stamps in good condition. Value of a single cancelled stamp is £ 50,- (GBP) according to Stanley Gibbons 2020 (see photo of relevant page from Stanley Gibbons). 

Postage to the UK with a normal letter costs £ 4,- If you want to be on the safe side, which I would recommend, it can be sent registered, with track & trace and insurance, which would cost £ 14,- For countries further away please inquire about postage beforehand.