The Singer model 201K was the company's top of the range machine when made and is a work-horse still capable of reasonably heavy work. A strait stitch machine, many accessories are available to enhance the scope of it's performance. These machines have something of a following and the internet has much information to offer. Two examples are here: http://www.singersewinginfo.co.uk/201/

And here : http://www.sewalot.com/singer_201k_sewalot.htm