High Standard Supermatic Trophy .22LR

I recently posted a question and two photos of my High Standard .22LR pistol. I would really appreciate it if someone can give me the appx mfg. date and appx. worth. Serial number is #1530XXX. I think that it would grade at least 98%. Only flaw that I have fount is slight discoloration on the trigger. Believe that could be polished.
Thanks to any and all for any help.

I'll get all of this right sometime. This High Standard pistol has I guess what is called a "Bull Barrel" screws on botton of barrel to mount weights and an adjustable rear sight.