Right side is a date
丁卯三月製之 Made in March, year of the Rabbit (fire). Its a zodiac year. Could be 1987 or 1927 (or older, 60 year interval)
Left side could be indeed be 穆齊. The part below that is a monogram (花押). I don't think its Iwasaki Bokusai. I don't think he was a lacquer maker, and lacquer ages poorly unless its treated very gently.