Original Baltar Lenses - What kind of mount is it???

Описание: I acquired this set of lenses from a friend of mine. After some cleaning and polishing they are almost as good as new. The focus and aperture on all three are very smooth. The 100mm needs the front doublet taken apart and recemented. The main thing is I would love to find out what type of mount theses lenses have. I would like to get them converted to PL if possible. I need to know what the original mount is so I can do some research to find out what the flange distance is on it. If you know the mount that theses lenses have please leave it in the comments below. I would greatly appreciate it!

Thanks!

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