I guess if it's not in the picture, it's because you don't have it
- Spare front sights
- Spare rear sights blade
- Firing pin and extractor
Our local dealers had a few of them (with case and parts) they were listed at $1,000 and probably sold for $700-$900
Your gun was made in the early 80's, the two extra magazines are worth about $50 each, a new replacement grip can be had for about $130US from Dennis (www marschalgrips com)
The GSP pistols are the best if you are serious.You won't go wrong with the GSP. I have two older ones like the one you posted. They usually run about $1000.00 used. Peter Krause in Toronto has parts for them. wwwDOTtargetshootingproductsDOTcom. Brand new GSPs are $2300 and $1300 for the conversion unit.
By the way they do not sell the single stage trigger anymore. I like them more than the two stage triggers.
The GSP pistols are the best if you are serious.
Single stage triggers are available from Earl's Repair in the USA. The two stage can be made a single stage and are more adjustable.