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No sn data for that model I can find.
Cornell Publications has a book on the company that might help
"AU" prefix indicates 1980
'AH' serial prefix indicates manufacture in 1971.
Given the poor description; 1-100 USD.
Model 930 is the Nickel plated version of the 929 - value depends upon condition: fair condition $50 to Excellent condition $250
25-125 USD or so depending on specifics
50-100 USD
930
The first Porsche 930 was manufactured in the year 1975. At that time, it was also known as 911. It was this German auto maker's top of the range model.
20% of 930 = 20% * 930 = 0.2 * 930 = 186
930 is not a fraction but as a decimal, it is 930