hi,
the medal was constituted by the exiled Czech Govt. in London, 1943, however, only paperslips were issued (first issue early March 1944). In early 1945 CIABG photos, ribbons can be spotted on BD blouses. Majority of the commemorative medals was struck in Prague (3 issues), while one series is believed to have been made by Spinks in early 45. These can be easily identified, sadly, the site mentioned above does not include the 'london' issue. See the pic attached. The main difference is the loophole for the suspension ring, which actually forms the sword's pommel, unlike the Prague issued medals. (several other subtle differences (metal colour, font used on the reverse, ribbon colour) can be found, but the loophole is a sufficient and definite give-away).
4 clasps were issued to be worn on the ribbon, 'Velka Britanie', 'Francie', 'Stredni Vychod' and 'SSSR' (UK, Fra, Middle East and USSR).
The abbrev. clasps depicted should be worn on a small ribbon sewn on a uniform, not the medal.