Thank you for your responses. I found an email the seller sent me after he sold it to me and I pasted it below. Apparently the Miles that sold it to me is not the one that built the cannon.
They were custom made from scratch.
He put A # on each one under barrel.
Most had a number on trunnion also.
The number starts with "J"....not AJ
Could be part of his name?
I never found out who he was
The lady I got 14 of his cannons from told me he had passed away.
She got all his cannons....about 300 of them.
I was too late to get the really big ones on trailers etc.
I would guess he died 4-5 months ago.
She also said he went to Cannon shoots and he was in few books.
She sold all his stuff including 2 shops of tools cheep.
Like 2 full shops both wood working and metal working for $1,200
If she was closer I would have bought them.
Just tons of tools....lathes,drill press,shapers, Mills lots and lots
And chests of hand tools craftsmen and snap-on etc
Makes me sick thinking about all of it.
She is East coast
He was Pa
Too far to go for me.
She was selling stuff before he was 6 foot under.....WOW
House and 2 shops all went cheep.
Miles