Although the lens seems to be "Made in Japan" the brand "Porst" is German. Actually it's the name of a photographic shop (Foto Porst) and equipment retailer, also offering development and printing.
Please klik
Camerapedia.orgklik
Homepage (German) if you want to see the home of Porst
This lens seems to be made for the German market, hence the print "Extrem-WW" which is German for "extreme wide angle".
This lens is in excellent condition with flawless glass..Please view the physical condition of the item, and the pictures taken with this lens attached to Sony Alpha 900.
It is being sold altogether with the Front and Rear Caps, for IDR 2.500.000 (equals with US$250 or S$380)
Please write to: acoustica.trade@gmail.com
Below are the samples of the pictures taken by this lens with Sony Alpha 900: