Definitely a “Dob” ( a Newtonian Reflector on a dobsonian mount )
Skywatcher or GSO Bintel ( what ever is the cheaper )
6” or 8”
It should come with a couple of Plössl eye pieces 10mm and 25mm
I think Bintel give you 3 eye pieces , a 9mm , 25mm and a 30mm superview plus a moon filter
Get them to replace the straight through finderscope with a right angle finderscope at no extra cost . Straight through finderscopes are a pain in the neck literally
Good luck and I hope your son enjoys this new adventure into our universe
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