Nickerson Turfmaster parts & further help

Hi there, 

A bit of a sad post for me. My father has been a mowing contractor, repairer and mower enthusiast for 60 years. Unfortunately, he now has dementia. 

It's breaking my heart but we are having to get rid of his precious machines. He mainly worked with Nickerson Turfmasters. Does anyone know if the parts of any of these machines would be of any use to anyone or should they all be scrapped?

Also, I have found a Hayter Osprey in one of his garages I would like to sell but I'm not sure exactly of the age of the machine or any specifics - would anyone be able to advise me?

Many thanks for you help.