Finding Out Who Made This Sink?

This porcelain, double drainboard, double sink unit has been in my grandmother's house since my father was a baby child. He is 64 now. My husband and I have been remodeling the house and cannot find a brand name on the unit, anywhere. It is actually in pretty good condition. There is some rusting underneath where the plumbing is. The sink tubs themselves come bright white after bleaching, or at least they have the 2 times I have done it. We are painting the kitchen right now, so in the picture, there is some discoloration, but it wipes off, this picture I took to do a "before" and "after" type of thing. I have seen some similar sink/cabinet units on the internet for sell for up to $2500, but they aren't exactly the same, I have not found one with 2 tubs anywhere, therefore can't find the maker. Please help!