[PxTx]

Ansen made the originally. Motion and hundreds of other places sold them in from some time in 1969 through the 1970's. CP later- like 1997 had Ansen do a few more runs (500 qty min) and simply private labled them. The newer ones were made with different tooling from the originals, but it is hard to tell them apart from the outside.

The chrome Motion ones seem to have been less common and unique.