Should I use it or just keep it

About 25 years ago I was given the pistol pictured below in exchange for some yard work. It normally sits in the box on a shelf. It does still work. Is it worth anything? Should I shoot it or just leave it be? Is it worth a tear down and rebuild?
1564800519_12165411745d44f607809762.90122462_20190802_224253.jpg
1564800537_11103270925d44f6198d98b3.97712141_20190802_224306.jpg
1564800553_11549130665d44f62949ed66.28313861_20190802_224317.jpg
1564800561_8320322125d44f631365826.52658909_20190802_224330.jpg

 
That’s really nice. Just a week ago I had a friend that got one just about like yours. It had the plastic grip. I found a site that helped date it, his was a 1977. It was a bit oily but that was a good thing. Couldn’t believe the seals were holding so well. I think they made them in .177 .22 and a bb version. Models 137, 132, 130.?

From what I read 8 pumps was max. His gun held air and shot great. 405fps with 7.4-7.9gr pellets? 8-405, 7-385, 6-340, 5-288, 4-230, 3-188, 2-128 1-pellet didn’t make out of the barrel 😁

I think Baker Airguns sells rebuild kits.

Mat