Stan,
You can go to Legacy Collectibles to see the wide variation in prices...
The Frequently Asked Questions (FAQ's- see "Sticky" at the top of this New Collectors Forum) page 19 lists the parts which should show all or part of the serial number. Page 58 shows a labeled parts diagram. The numbers on some serial numbered parts are not visible from the outside... if your gun is "all matching" then the value increases at least 50%.
Same reasons as mentioned here above; more photos are needed to assess condition and to clearly see serial numbers and markings
