Lot- Seven (7) Vintage Testing Plugs or Jacks; Right Angle and Universal Plugs

Description

For sale is a lot of of Seven (7) used plugs or jacks, some of which could have been used with radio testing equipment or just as connectors.   Three of them (two black jacks that look much the same with horizontal knurling, and a brown/burgundy jack), have a bolt which allows them to be taken apart.  The jack with the red tab in the front actually depresses, allowing you to insert a wire which is then held in place by tension.  The red tab has a chip in it, but the jack is still functional.
The black jack with the thin probe I do not know how it opens.
Two of the items (the ones with the three prongs) are "Universal Plugs" Made in Japan.  These items have not been tested.
These items were obtained from an estate sale of a serious radio hobbyist.   He had radio related parts from circa 1930 through the 1980s.  Not sure how old these items are, but the "right angle" jacks look much older than 1980s vintage.
Sale is for the lot of Seven (7) various plugs or jacks as shown in the above photographs.