Hi. This caught my attention because of events reported in the AudioKinesis thread.
Our own Duke LeJeune of AudioKinesis was flooded out recently. He lost connectivity at home and at his shop. During the outage, Duke found a library where he could correspond with TalkBass and his customers. AudioKinesis is located in Princeton, Texas.
Klein Pickups is a stone's throw from there, in Denton, Texas. I would think there's a good chance that they were flooded out, too:
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As for the various Klein models, may I suggest that 1. by looking at photos or reading the product descriptions, you cannot tell what exact materials are used, and 2. even if the materials were identical across models, I assume that the design of each model's construction differs enough to matter.
Although among his split coil P pickups I only ever played the Epic 1959 P so far, I am confident that Klein's Epic 1958 P is a very different sounding pickup.