Hi all, If you own or are planning to buy a second hand sewing machine, the chances are you will hear the terms industrial, antique, vintage or even retro as part of the description. The terms can be confusing and even misleading. Especially, if used incorrectly. The words tend to be interchangeable, used as key words or marketing devices to “sell” rather than describe an object accurately. Most of the time, this shortfall is due to a lack of knowledge rather than an attempt to deceive. Sellers often use the term "industrial" to refer to older Singers and other brands with models pre-dating the 1960s. This description is based on the machines being heavy, built from iron and rock solid when you sew on them. This robust sturdiness gives them the persona of being tougher, stronger and more hardworking than today's modern equivalents. Take this Singer 15-91 from 1952 for example. When I purchased this, I was told it’s a heavy machine, so it must be a heavy-duty