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By all means send the photos, but I will be able to answer your question without that. When I started having an interest in antiques (1970s) These items were coming onto the market (both table and cabinet models) Some were hand operated, some treadle operated and some converted to electricity by adding a motor. Some designs allowed the machine to 'fold away' into the cabinet after use. The most common makes were Singer an Frister and Rossman. Still typing...
Nearly always black with attractive gold and colourful transfers , they were at that time about £10 each and were purchased by trained or semi skilled seamstresses because they actually preferred that type of machine for their work. As the years have passed, there are still very large numbers of these indestructible machines in existence - except that now they have been overtaken by much more sophisticated electric models with computerised stich choices. Frankly they have been a white elephant for years and I would say that their value has remained unchanged. Good looking things but redundant technology, heavy and take up space. I have turned down two this week from people visiting my shop to sell identical things. Sorry. Greg