These are going for between 75-150 dollars.
No.
Model variation
Might have been replaced.
I have a marlin model 60 with a gold trigger..the price difference is not by much if any at all..they both cost the same. some gun shops will charge more, but most usually don't and charge the same. A model 60 with etching and wood work can sell for more than one with just a gold trigger.
no,plain and simple
Marlin- Mdl 80 with an adjustable trigger
At a good gunsmith's shop. Maybe Numrich's Gun Parts (search gunpartscorp) For the complete trigger guard assembly, including trigger, safety, springs, pins etc., you can get it from Numrich, Midway USA, Brownells or direct from Marlin. If it's just the trigger or other individual trigger guard parts you need, you'll have to get those from Numrich for a different model Marlin.
The Marlin Model 3000 was the chain-store version of the Model 336. They added a gold trigger, gold bead sight and have no checkering.
gunpartscorp website.
$125.00
This would be best left to a qualified gunsmith to perform.
According to wikapedia it is a model 60 made for big 5 sporting goods stores. It has a gold plated trigger and stainless bolt.