Nice. This is a New Minnesota A Sears mail order catalog sewing machine made late 1909 or early 1910 by Davis. There are other manufacturers that contracted with Sears to make New Minnesota A which is a bit confusing. You have the early A9 version which uses the Davis Long needle Boye 10 and is nearly 2" long. The later or A10 uses the standard 15x1 Boye 16. MTx190 is a substitute industrial needle that can be used. New old stock original needles are still around but a bit more expensive.
http://www.clawges.com/sewing/MN_A_manual/index.html
Jon