Is the HP-75c valuable at all?

[ostego]

Hi,

My father was going through his old gear, and asked me to sell his pristine condition HP-75c for him.

I've listed it on eBay for quite a low starting price, and it did occur to me whilst listing that I could inadvertently be giving away a massive bargain if this is a super collectible item!

The calculator works perfectly, has the owners PAC magnetic strips and some games, and has all of the accessories.... Would this have a high value to a collector? Or is it just an old calculator in your eyes?

It does seem to carry some history with it as from what i understand it's the first "computer" ever made or something like that (can't remember exactly what my dad said)

Thanks for your help on this!