Unless there is some unobservable flaw with it, this looks to be in lightly used condition, a mid grade gun.
Does it have ejectors (probably) or just extractors? This might make a $200 difference.
The Simsons have many of the qualities of a Merkel (in fact, they may have shared some production facilities and materials at some point) and JP Sauer, but not the name recognition. Few people really know the German guns well enough to spend on them what they should be worth.
IMHO, with extractors, the market and some exposure would probably support a price approaching $1000.