Hamilton's DCM, QSA & KSA sold for £17/-/- at Glendinings in Sept 1961 as part of Lot 268.
It is interesting that his published MiD (LG 10/09/1901 p5949 Roberts : up to end Nov 1900) pre-dates Magersfontein.
As this post is the most Boer War DCM's I have ever seen I thought I would be able to make a definitive statement on the change over from Trophy of Arms to Edward V11 obverses. But no -looking at the Gazettal dates there appears to be a mix as late as September 1901- they must have had considerable stock of Trophy of Arms DCM's at the Mint or where ever they were held when the war started.
From the DSOs issued for the Boer War, it would seem there were many VRI cypher DSOs left over when Queen Victoria died and these were issued into the first part of Edward's reign. It appears it was a similar cased with the DCMs.