I need some info on my Harrington & Richardson Inc. Topper

I am looking for some info on a gun I was given the task of getting restored. It was my father-in-laws and has basically been sitting in a shed rusting away. I am not really interested in the value due to the fact that the gun is now a family heirloom and priceless to us.

Harrington & Richardson Inc. Topper Model 12GA. 3" MOD Patent # 3988848 Serial # BB459967

I do know the patent number was registered in 1974, and the gun is a Single Shot 12GA Topper. What I would like to know is when it was made and which Topper Model it is. Thank you for any info you can offer us.

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