Airsporter serial numbers

[DEAN C.]

Hi.
I have Mk 1 .22 GB16190
Do you know the year please?
My Dad bought this new but cannot remember year.I've shot hundreds of rabbits with this as a teenager in the 70's.
It was the first gun I ever fired at about 6 years old,at 9 years old I used to sneak into my dads room when he was out and take the odd shot out of the bedroom window with this!!He still does'nt know that 35 years on.(I'm 44 now)
As you can imagine this stays in the family!!

I also have a Mk3 or 4 (not sure which)It looks like GT681?? Very Square fronted stock and steel loading tap but not auto lift.Could you ID this please.
Used to have a couple of others including aMK1 "s" which I regret selling.