Dating suntour parts

I would be quite surprised if the model is not stamped.

How do bicycle mechanics deduce the model - do they know them all from experience?

Miyata is a Japanese manufacturer of bicycles, unicycles and fire extinguishers. Miyata was also one of the first producers of motorcycles in Japan under the name Asahi.Am I supposed to find a model number stamped on the fork, as with most other bicycle components, or should I deduce which fork it is from the features e.g.wheel size, brake options, outlook, locking and adjustment mechanisms.The engineers repaired the bicycle, and the company began to repair bicycles as a side business.Eisuke's son, Eitarō, manufactured the first Miyata prototype bicycle in 1890, using rifle barrels produced at the family's factory.