Stationery motor - New Record 2C-103 - What's it worth?

A friend of my cousin has this sitting in their backyard and are thinking of selling it, however they first wanna know what it's worth. Any one got any idea?? Some details in the email I got below:

it is a New Record 2C-103 with original petrol tank and crank handle and a home made metal cover.
Has a patent number on it 58792 if that means anything. Made by New Record machinery Co P/L in West Melbourne no idea how long ago but been in family for as long as I remember.My uncle used it to drive a saw to collect firewood,around Rutherglen.
Hasn't been running since Andrew went into nursing home and probably a couple of years before that.

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contact maitland council and ask for the organisers for the steamfest of maitland,tell them you need to get in contact with anyone involved with the steamfest and go from there!!

There are a few stationary/steam engine clubs around Jules, try contacting lake goldsmith steam rally people(its about 20ks from ballarat).
They get shitloads of people there, there would have to be someone there that could help, possibly a classifieds on a website or newsletter too

Cheers guys. I'll pass the info on.