The price of sewing machines in the 1970s was not low at that time. According to the price at that time, the price was different because of different brands. The basic price was between 100 yuan and 250 yuan, while the Shanghai brand sewing machine was famous at that time, and the new machine was around 180 yuan.

1927, China's first domestic sewing machine was born in Shanghai, named "Golden Lion". In 1946, the word "golden lion" was changed to "invincible", meaning "invincible hand all over the world". 1966, in order to unify the Chinese and English trademark names at home and abroad, Invincible Brand was renamed "Butterfly Brand" again, and the English trademark was "Butterfly". Since then, the trademark "Butterfly Brand" has continued to this day.

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Maintenance of sewing machines should also pay attention to the following points:

1. After the work is completed, insert the needle into the pinhole plate, lift the presser foot, and cover the machine head with a hood to prevent dust from invading.

2. When starting work, first check the main parts, how heavy it is to step on it, whether there is any special sound, whether the pointer is normal, etc. If abnormal phenomena are found, they should be repaired in time.

The machine has been used for a long time and should be overhauled. If worn parts are found, replace them with new ones.

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