TOKYO, May 29 (Reuters) - A global aluminium producer

has offered Japanese buyers a premium of $175 per metric ton for

July-September primary metal shipments, up 18% to 21% from the

current quarter, three sources directly involved in quarterly

pricing talks said on Wednesday.

Japan is major Asian importer of the light metal and the

premiums for primary metal shipments it agrees to pay each

quarter over the London Metal Exchange (LME) cash price

set the benchmark for the region.

For the April-June quarter, Japanese buyers agreed to pay a

premium of $145-$148 per ton , up 61% to 64% from

the prior quarter.