You can then make your own decisions and be confident of them. Copies are given scratches, dirt, wear, and sometimes even cracks to make them appear old. To look more authentic they are usually built to the exact dimension of the original. Undoubtedly some copies were made to be deceptions, but many makers build copies as study projects-the best way to learn another maker's style is to try to copy it. Players order copies for various reasons .
Some people simply prefer the look of an old instrument.
A model is a violin modeled after a specific maker's violins, or after one in particular. It may or may not stick to Stradivari's dimensions. Thus his model looked different from Amati's, and so his originality progressed. Because originals often seem to evolve rather than come about by spontaneous generation, it is hard to draw an exact line between originals and models. When looking for any instrument, the biggest considerations are authenticity, condition, sound quality, and appearance.