(Adds naira level, background)
By Oludare Mayowa
LAGOS, May 4 (Reuters) - Nigeria's central bank has lifted a ban on currency allocation for importers bringing in goods worth up to $20,000 per quarter, it said in a circular seen by Reuters on Thursday.
The bank in 2015 placed a restriction on 41 items for which importers could no longer get dollars, including rice, toothpicks, cement, private jets, steel products, plastics and rubber, soap, cosmetics, furniture, Indian incense and foreign bonds.
Aimed at conserving its foreign reserves, the move curbed access to dollars for importers bringing in a wide range of goods, helped fuel the currency black market and worsened investor perceptions about policy in Africa's biggest economy.
"Importers of items classified as not valid for forex with transactions value of $20,000 and below per quarter shall now qualify for allocation of foreign exchange," the bank said.
Last month the bank cut the amount of paperwork needed for small firms to buy dollars, to ease doing business and help narrow the gap between official and black market exchange rates. It said it will offer them up to $20,000 per quarter.
Nigeria introduced capital controls in 2015 after a sharp fall in oil prices caused chronic dollar shortages, weakened its currency and slashed government revenues, tipping the economy into its first recession in a quarter of a century last year.
It subsequently introduced and then abandoned a currency peg and now uses a system of multiple exchange rates which the bank says help it manage "frivolous" dollar demand.
The naira was quoted weaker on Thursday at an investor trading window, at 382.14 per dollar, data from market regulator FMDQ OTC Securities Exchange showed. The official market rate was 305.20 and the black market rate 391.
Vice President Yemi Osinbajo had said on Tuesday that Nigeria aimed to replace the list of 41 import items with more trade policy-driven restrictions taking into account items that are required and locally unavailable raw materials.
The central bank has pledged to sustain its currency intervention to help narrow the spread between the official and black market rates, its spokesman Isaac Okorafor said.
In theory, greater liquidity should lead the rates to converge. The bank offered to sell $150 million at an auction on Wednesday and sold $65.94 million previous day. It planned to sell its weekly $20,000 each to exchange bureaus, Okorafor said. (Additional reporting by Camillus Eboh in Abuja; Writing by Chijioke Ohuocha; Editing by Catherine Evans)