What is different about it? The one in the link is a newer design but looks similar to the older one.
It is hard to sell or estimate the value without knowing which type of device it is.
They range in price from $800.00 to $5,000 new.
There is the frequency generator part of it which is the Progen 4050 which is listed in the link below.
https://www.dfe.net/links_fg.html
Then there is the device it is attached to it, which is what I am not certain of.
Can you describe it?
Dan