Upvote:2
I can get up to 1957.
It is the first for the first broadcast of the Spanish LoterΓa de Navidad (Christmas lottery), as stated here(warning: link in Spanish) and other sources.
It is worth commenting:
The Christmas lottery was the main lottery event of the year, so I would guess that regular (weekly) lottery events would not be broadcast until later.
Originally it was just broadcast, without any anchorman (the first one would appear in 1966)