It's been reported that the first appearance of the drums came in July of 1967 when Moon first received them during the Who's US tour. The drums took six months to create to Moon's specifications and contained many unique features. Who lighting manger and friend John Wofff helped to design the drums and bring Moon's imagery to reality. Everything down to the smallest piece of hardware was developed and ruminated upon by Moon.
The second fascinating detail about the drums and their defining characteristic are the specially commissioned pop art panels requested by Moon that decorate the kits shells. Psychedelically painted 'Pictures of Lily' as well as 'Who' emblems adorn the outside of the kit. The finest and greatest of these panels contain the moniker, 'Keith Moon Patent British Exploding Drummer' in typical Moon self promoting fashion! The skins covering both bass drums featured the 'Who' logo flying in three dimensional glory and emanating from a head shot of Moon.
Included at the bottom of this 'rock room' rant is the complete footage of the Who on the Smothers Brothers show in 1967, that features Moon miming with the Lilly set as well as detonating it with a bass drum packed with explosives at the conclusion of the performance. This act has long been rumored to be part of the impetus for Townsend's hearing loss. The incident also imbedded a rogue piece of cymbal shrapnel into Moon's arm. As far as I know there is no other footage that exists of the kit in action, although there are a number of photographs.
Smothers Brothers 1967 Complete