So, I have them. 6 to be exact. I have no idea who made them. They are exactly how I thought they would be. A central solenoid ( hollow coil ) with a slide that acts as the coil center more or less. No markings at all. Very interesting machines for sure and damn near silent. I have tested them with the power supply that came with them and they are even somewhat adjustable. I was able to short the strike down to about 1mm and boost it up to about 3.5.

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