What is the value of a marlin baby carbine 44 1893?

The rifle that you are describing is a Marlin model 1894,not a model 1893.The model 1894 was the only model of Marlin produced as a baby carbine in the caliber 44-40Win.IT was produced with a 18in barrel and a half magazine.These were made from 1894-1934.The value of these baby carbines range from 490-1,400 dollars for a rifle showing between 10%-60% of its original finish,and a good bore.