I have a singer 15-91. Only straight stitching. Never needed zigzag. Its an all metal machine with a potted motor. It was built in 1948 and I sew everything from silpoly to multi layers of straps. I bet it could sew leather. It took my willingness to learn how to repair it because when I bought it for 25$ it needed to be rewired. The original wires were from 1948 and even then didn't need to be done I just felt safer. If you purchase a finished I bet other then a clean and oil you should be able to run it for years.
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