Look for an older all metal geared machine with multiple stitching options. Forward and reverse stitching along with straight, zig-zag and the ability to do a bar tack are all beneficial options. A free arm machine helps a lot with smaller circular pieces of work.

Some brand names I have heard about are Necchi, Pfaff and Singer.

FWIW I have made quite a lot of my own gear with a Singer home style sewing machine. It is a model number 538 Stylist.

If you purchase and older machine get it checked out thoroughly and ask the owner if you can run it through a test by sewing something simple and quick. A lot of times machines that do not appear to function only need a good cleaning and lubrication to sew like new.

Having a good local repair shop close by is an added plus.

By all means try to locate a manual for your machine. It will help you sort out small problems like adjusting thread and bobbin tension for example.

I hope this helps.

Newton cool
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One day on the trail is 100 times better than one year on the couch!