Quite possibly a kinemetrics recorder. No way to know for sure unless it's cracked open ¯\_(ツ)_/¯ ... 4-pin socket for power, bnc for gps, giant multi-pin for sensor input maybe... one link is a screenshot because the image source page is no longer available...

its a military radio amplifier

References:

https://www.arworld.us/pressReleases/080123/KMW1040.jpg

Reason:
I believe you're in the right ballpark but the link you provided didn't help me narrow it down. I'm not sure it's an amp due to the lack of controls. It could be a vintage rack-mount power supply for broadcasting or HAM gear. If you can find something more in line with this particular item... something from the period, preferably. Thanks for contributing!

Here is a reference that may help. Judging by the ripped off sticker I'd say its a band sticker but likely not the sticker for the product? It could be a Military Radio AMP power supply. Even if you reject this opinion I think the reference to the site might at least get you in the field surrounding the origin of this device.

References:

http://www.reforger.de/en/

Reason:
You are definitely in the right area but I could not match up the plug connections with anything.

Quite possibly a kinemetrics recorder. No way to know for sure unless it's cracked open ¯\_(ツ)_/¯ ... 4-pin socket for power, bnc for gps, giant multi-pin for sensor input maybe... one link is a screenshot because the image source page is no longer available...

References:

http://photos.app.goo.gl/sPFYyRcuA5eGWQj89

http://www.ieands.com.au/seismic-recorders/

http://www.researchgate.net/figure/The-K2-Strong-Motion-Digital-Recorder_fig1...

whups, i meant to say "something like a kinemetrics recorder" as kinemetrics is a company. attached ebay link is of another "strong motion recorder" (also happens to be made by kinemetrics!) with photos of the innards. you can see the empty spot where the battery goes.

References:

http://www.ebay.com/itm/304600332739

Reason:
Another opinion was accepted instead.