Is it a 1400?
Nope not that cheap one. Made of all steel construction & a walnut stock.
Ok then what about mod. 50?
Manufactured 20 years after that model 
Is it the Winchester model 1 ?
Yeah Winchester Model Super X1 
There is 1 thing about that poly choke that gives away 88 other things, Lol!
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Good guess
Is it a sportco mod 88, 12ga?
It is indeed, nice little bit of Australian history. 
Never seen one in the flesh, but I have a sportco mod 81 bolt action shotgun and it has the same poly choke / muzzle brake on it.
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It’s missing a bit!
It’s missing a couple of bits I think
Make that 3, lol.
Someone is cleaning the dust cover while leaning on the monopod…
Japanese?
Yes mate.
99 % right just short…
Does it have a Chrysanthemum
That one might, mine sadly does not.