This is indeed an early A-6, as has been mentioned (and I can assure you the seller
most definitely knows what he's talking about!

) The easiest way to tell is the lack of fairings, internal ammo cans (which is why the guns were staggered, these were later deleted and ammo was fed via chutes from cans outside of the turret) etc etc. This also has the early hand controller in it, which the replacement controller included in the auction is a later example. Overall not a bad turret all things considered, but needs a lot of work!