Help with a leaking “submerged” tub filler

[Abarclay87]

Hi there! I have a beautiful vintage tub set up that I would love to preserve as best as possible, however the tub filler is leaking and staining the basin of the tub. I had a plumber out to hopefully solve the problem but he cannot find the correct size “valve sit” for replacement. Does any one here have any suggestions for where I should look? Any help is greatly appreciated. Here are some photos of the tub for reference as well as the “valve sit” which is so damaged that we cannot change the washer. Thank you all in advance!

 

[hj]

You will NOT find a replacement that type of valve has been "illegal" for almost 100 years.

 

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[Tuttles Revenge]

I recently had a similar setup that we removed, but we kept the filler in that same location. We had to install a vacuum breaker on it. That filler can not be legally maintained by a licensed plumber as it presents a Dangerous Cross Contamination of potable water filling below the flood level of the tub.