Just wondering does anyone possess a First Printing (16th Impression Stated) of the 1966 Paperback Edition of the Hobbit published by Unwin Books

http://www.tolkienbooks.net/php/details.php?reference=21350

I see from Neil's website that there were 20,000 copies of the 16th Impression printed, however strangely I have never come across a 16th Impression in quite a few years of searching. Just wanted to double-check that it actually exists? Many Thanks.