There doesn't seem to be much information available. Just about everything I know, other than the academic papers, is available on the UK and Ireland Meteorite
page, Bryn Jones's History of Astronomy in Wales
web page, or on the Nantlle Valley History
web page. I have a photo somewhere that I think may be the empty and unused Coch y Bîg farmhouse, but that's on a hard drive on my desk...
I did call in to visit the local shop with the intention of buying a postcard, or other memorabilia, but it was closed down.
- Pontllyfni Post Office
I believe the Pontlyfni meteorite to be the only witnessed fall of a Winonaite, but the early reports, and then the Catalogue, even got the spelling of it's official name wrong. It really deserves some attention. I propose a toast to the Pontlyfni Meteorite, happy eighty-third anniversary....