and the National Library declined to comment on whether they would be interested in buying the work.
sites are the National Museum & Gallery, Cardiff, Museum of Welsh Life, St Fagans, Roman Legionary Museum, Caerleon, National Woollen Museum, Dre-fach Felindre and the Welsh Slate Museum, Llanberis.
The buyer then sold the piece to the NMGW
for pounds 557,218.
The museum's director general Michael Houlihan said: ``We are delighted to announce our exciting plans for developing and improving our collections facilities at NMGW
is producing a report in preparation for the inquest.
spokeswoman Julie Richards said: ``This is a priceless find in archaeological terms.
The hoard, bought by NMGW
with grants from the Goldsmiths' Company and the Heritage Lottery and National Art Collections Fund, dates from the middle Bronze Age and was found by metal detectors near Wrexham in January 2004.
This could make it the rarest plant in the world, said Mr Rich, NMGW
head of vascular plants.
Alun Gruffydd, the island's principal officer for museums and culture, said: ``We are keen to build on key projects which already demonstrate our close ties with the NMGW
exhibitions have recently travelled to Aberystwyth, Conwy, Newtown, Swansea and Tenby.
medievalist Mark Redknapp said: ``They are both very important.
We are delighted with the announcement,' said NMGW
deputy director general, Eurwyn Wiliam.