Garage find - need info

[VK4WDM]

I happened to come across this unit but I have absolutely no idea what it is

I am assuming that it may be an old school of the air radio,
but as I say.... I have absolutely no idea

All I know is it was manufactured in Brisbane, and that it is an old valve and crystal unit
I have no idea of age or even how to hook it up

I am assuming it uses a straight wire antenna from the lug on the top right
I am not sure what the two positive and one negative posts are for

I am hoping someone out there maybe familiar with this unit and may be able to offer instructions on its use

The make and model is....  
CRAMMOND CTR20 (Crammond Radio MFG. CO PTY LTD. Brisbane

Regards
VK5FRLH

---

Crammond radios were in common use during the 1940's, 1950's and 1960's for a variety of civilian uses (the one in question has marine frequencies written on it) and there may be a variety of museums etc that would interested in it but they would probably want it donated rather than pay for it.

I would not worry about a paint job but please give it a really good careful, gentle, clean with a blower or vacuum cleaner. Have a good look to make sure that there are no leaking oil-filled capacitors or transformers because they might contain Polychlorinated Biphenyls (PCB's).

Wayne VK4WDM