Looking for advice / valuation - Pro-Co film drying cabinet

[danbenford]

Hi, i recently acquired this cabinet from a man who was clearing out his house, he was a photographic journalist.
Anyway long story short i identified it as a film drying cabinet but i have no idea of the exact value as i wish to sell this, i cannot find this model for sale or sold and thats probably because i dont know where to look.

Thanks for any help, the picture was taken outside before i could move somewhere to store it and dry it out to test, i hope you dont feel im taking advantage by asking this but i thought the best place to come was to experts.