Looks like a nice little kit - probably 70s era:

http://www.vintageolympic.co.uk/badges.html

To me (from the badges) it looks like beetwen 69-79, but i maybe wrong! It`s not before, ther I am sure!

Those will be cool little drums and I suspect in all normal sizes too. The only major thing wrong with 6 lug drums is that the tuning drifts from optimum faster, so, if you don't mind feathering the tuning. .....The main gap between Premier and Olympic , is in the hoops, throwoff and other hardware. These, account for the majority of the tonal difference. A good Olympic can rival a Premier drum.

I don't know anything about olympic drums but these look really nice. You should buy them..