Sounds like an oxymoron but I've heard that the 47W63rd pressings on the thinner vinyl (without the ear and deepgroove) originate from the 'Liberty' era ie. around 1967 onwards.
Strangely enough, these titles usually have the original laminated sleeves, so it can get a bit confusing. The labels are marked '47W63rd' and there is usually 'RVG' in the runoff.
Titles I have seen in the past (from the 1500 and 4000 series) are:
Freddie Redd 'The Connection'
Donald Byrd 'Byrd In Flight' (I have one of these and it sounds )
Stanley Turrentine 'Up at Mintons Vol 1'.
Thoughts?