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These mostly can be identified by the tension on the face plate of the machine. The machines can vary WILDLY or be similar but with a different name.
A bit of info...
Although not really collectable, the "clones" can be very serviceable simple to use machines.
They beat the bargain machines sold at discount stores. Here's why...
inexpensive
Full reverse capabilities
Adjustable presser foot pressure
Feed dogs drop
Class 15 bobbin, side loading, oscillating hook
Uses standard home sewing machine needles
they have more powerful motors so can sew faster and have better piercing ability
(amperage rated motors (1 to 1.5 amps)
all metal parts
common, easy to find, low shank accessories fit them
parts are available for repairs
great for free motion
hems your jeans
easy to see the needle - the tension is around the corner
if it wears out you can easily find another one like it but most likely you'll be dead first
The clones can be easily rewired
Here are a couple good articles on the Clones if you would like more information.
http://blog.sew-classic.com/2008/12/...-15-clone.aspx
http://sewing-machines.blogspot.com/...s-and-60s.html
The articles should explain it better than I can and there is a lot of info scattere throughout this whole thread.