I'm not sure when Shelhammer started working for Niedner. I believe there were other stockmakers employed at the Dowagiac shop. This rifle chambered in .25 Roberts has a barrel by Sukalle and was made by Niedner in 1929 or 1930.

http://zincavage.org/N-S1.jpg
http://zincavage.org/N-S2.jpg
http://zincavage.org/N-S3.jpg
http://zincavage.org/N-S4.jpg
http://zincavage.org/N-S5.jpg
http://zincavage.org/N-S6.jpg