* March robusta coffee was down $1, or 0.1 percent, at $1,580 a tonne, after earlier falling to $1,575 a tonne, the lowest for the second position since early October.
* Dealers said the structure had weakened after prices failed to gain a foothold above $1,600 in the prior session, but buying appetite at lower levels was providing some support.
* Focus remained on ample global supplies as the harvest in top grower Vietnam gathered pace but recent weather conditions could cause some delays to early shipments, traders said.
* March arabica coffee was down 0.60 cents, or 0.6 percent, at $1.0630 per lb, hovering above a two-month low of $1.06 set in the prior session.
* Prices were weighed down by a weakening in Brazil’s currency, which encourages producer selling by boosting local returns on dollar-traded commodities like coffee.