Goldfink is yet another, relatively obscure German brand know for making high quality products. In my opinion, Goldfink was the Matador of 4-5 years ago.
Penboard.de has repository of nice specimens if one is interested in learning about their models.
Here is a two page leaflet showing their diverse portfolio (images belong to eBayer watermarked). I dont think it shows their complete line of pens but it has their rarer models like Transparent and Long-short safety pens. It is believed that their products were contract manufactured by various makers around Berlin.
Goldfink is better know for their Wonderfüller which is a hybrid of twist and button filler. I had one in a #2 size but am regretting selling it. I had a few Goldfinks but one latest acquisition prompted this thread. It is the top pen in the pic below. I think it is the Preisschlager (economy) model per the leaflet above. Cosmetically it is in very good condition and has an amazing #6 flex nib. Their nib denomination runs smaller than typical and perhaps #6 is more like a #4 or #5. The faceted captop design is very attractive and one of my favorite feature of this brand.
Other pens below are a #6 stylograph safety, MB142 and MB146 sized piston fillers.
If you have any please share details and your experience with them.