Sig will work on the older internal extractors no problem. I bought a W German marked one (an oddity, will get to that in a moment) and had the Sig Service Package done and put on the E2 grip. Here's the list of price options:
http://www.sigsauer.com/upFiles/CmsC...st_April13.pdf
Any older West German marked gun can be done with the "modern" enhancements like the SRT and E2 grip installation.
The older West German/German marked guns will have the proof marks under the front of the slide which will tell you year of production:
http://sigforum.com/eve/forums/a/tpc...5/m/7320040262
I have an odd one that's marked "Made in W Germany" with the internal extractor but the proof marks (KF) indicate it was made in 1995, well after reunification. Even the Custom Shop guys at Sig said "that's not possible" until they saw it and scratched their heads. But still did the service package without question.
$575 is a good price for a good condition German marked Sig. I'd probably snag it up at that price.
Experience is a cruel teacher, gives the exam first and then the lesson.
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