GPZ900-A1... What to look for?

Hi
I might have come across at really cheap 1984 GPZ900-A1 for $1400, Redbook lists them at $2900- $3400 and at half this price something has to be wrong with it unless the guy is desperate (it is in a pawnbrokers shop at present and is incumbent free). Has reg and starts and runs well, no smoke at all, looks complete and in reasonable condition for its 20 years, and has gunmetal grey paint and white colour forks and rims, is that normal or someone done a shitty paint job?
(Have not had a test ride on it yet or had a really good look at it)
Anyway, what are the inherent things to look out for on these other than the usual checks please?
Wheel sizes; are they a problem for tyre selection, are the brakes good enough etc?
What are parts like to obtain and priced like for them?
Any information such as paint schemes, options etc is welcome information.
Basically this will take away the pressure and a lot of service km's and expenses from my 12R and will pay for itself after a year or so as a town-mule milk n bread runner
Thanks for any input.
I might have come across at really cheap 1984 GPZ900-A1 for $1400, Redbook lists them at $2900- $3400 and at half this price something has to be wrong with it unless the guy is desperate (it is in a pawnbrokers shop at present and is incumbent free). Has reg and starts and runs well, no smoke at all, looks complete and in reasonable condition for its 20 years, and has gunmetal grey paint and white colour forks and rims, is that normal or someone done a shitty paint job?
(Have not had a test ride on it yet or had a really good look at it)
Anyway, what are the inherent things to look out for on these other than the usual checks please?
Wheel sizes; are they a problem for tyre selection, are the brakes good enough etc?
What are parts like to obtain and priced like for them?
Any information such as paint schemes, options etc is welcome information.
Basically this will take away the pressure and a lot of service km's and expenses from my 12R and will pay for itself after a year or so as a town-mule milk n bread runner

Thanks for any input.