John and Nick that was my thoughts of what it is... I'll putter with it for sure! 
For my BPRE I still need a couple tubes for the punch controller and 1 for the power supply probably replace a couple caps too.

On Sun, Jan 16, 2022 at 8:30 PM John W9DDD <w9ddd@tapr.org> wrote:
That's the idea, but looks a little different.

John, W9DDD


On Jan 16, 2022, at 6:40 PM, Nick England <navy.radio@gmail.com> wrote:

Something like the BRPE “synchro-pulse generator” ?? Photo in this sales brochure…

On Sun, Jan 16, 2022 at 6:09 PM John, W9DDD <w9ddd@tapr.org> wrote:
Here's a mystery part.
The box is dated 1970, is that too early to be a 40 series part?  It
says it's a relay on the outer packaging, the NSN lookup says isolation
relay.  To me it has the appearance of a mag pickup, like counting teeth
on a sprocket.

Kind of like this, but not threaded all the way and 4 wire leads instead
of threaded terminals.

https://www.anchorexpress.com/VDO-Inductive-Sender--Magnetic-Pickup-2--340-020_p_77301.html
--
---
----
The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD
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