Here is a description from ISMACS:[QUOTE][TABLE="class: bordertable ninefivepcent centered collapse alternate"]
[TR]
[TD="class: left top"]For cloth. Throat plate flush with bed. Large bobbin. Max. stitch length 5 1/2 to the inch. Shuttle #20758. Clearance under the presser foot is 5/16". Speed 2200. (In catalog 10/1952)[/TD]
[TD="class: left top"][/TD]
[/TR]
[/TABLE]
[QUOTE]
I am going to guess that it takes a 16x87 needle based upon what other similar Series 31 machines take. Jon may correct me. Needles are still available.