Ya done good. REAL GOOD. It's a close to a Winchester 52 as you're likely to find these days. I purchased the exact same rifle new while working as a counter drone at the LGS - probably about the same time yours was made. Employee discount worked out to about $150 then. Incredible little gun. I've often said I'd be willing to trade straight across for a heavy Anschutz 54. . .but I'd want to see how the Anschutz groups first.
As I recall, I went with an Automation Solutions sear to clean up the trigger (about the only area where these guns are lacking). There are probably better options now. The iron sight mechanism, front and rear, is excellent, though the rear will necessitate a little taller scope ring than the sightless American model might. The BKL air rifle scopes are the ticket if you need more altitude than the factory rings provide.
I started with a Weaver V7 RF (2-7x28) thinking it was going to just be a nice quality small game rifle, but the consistent, sub-dime 50 yard clusters proved I had something special. Tried an A/O V16 (4-16x42), but that ended up needing too tall a mount, and the glass quality didn't really cope with the magnification. Currently sporting a Leupold EFR 3-9x33 A/O with CDS knobs, and all is right with the world.