This is a replica USS Constitution cannon pine coffee table, made in the 1970's.
The cannon tube is also wood from having seen more than one of these in my day.
While fishermen and some ship did have wooden decoy cannons back then, the Naval vessels did not, so
it is a replica novelty table.
The table has a current value of $300 to $400 as it is. I would suggest not doing anything to it if
you are planning to sell it.
Some sites that I recommend are Varagesale.com, Chairish.com, Ioffer.com, Furnishly.com, Deconet.com, Lushpad, Krrb.com, and letgo.com.
You can also go to invaluable.com or liveauctioneers.com and search their directory for an auction house near you and consign to them.
To finish, I will need you to click the five stars at the top of your screen and hit the submit button, thanks!