Nakajima made great planes and Bombers for world war II. During occupation, several american companies got them making sewing machines.
The 180L is a walking foot, small bobbin, bottom loader. Its too old for me personally, I have several 280L models that have same configuration, but a large bobbin and parts are interchangeable with a Consew206RB. Juki Bought them out and produced the same machine as Juki DNU 241-HS. They added a kickout clutch and competed with Consew 206RB-3,4,5. They have since discontinued the 241 and have another MFG making the replacement. Nakajimas are really good, tuff machines. Use a 135/16 #23 needle with a cutting point and it will sew through an old shoe.