Anybody recognize this thing?

[kxxr]

I'd sure be glad to know what it was made for. It has rubber mounts between the parts to absorb vibration. It's made of light cast iron and made lighter by drilling and 'chambering' type cutouts visible in the upside down view. Could be built that way to help dissipate heat i'm guessing. It does have some numbers on the bottom like Rev 7/X and some serial numbers like 10- 53540 (not sure about those last 5 numbers but could re-check if it helps. One edge of whatever goes on it fits under the keepers on the right side of the picture and the nuts on the left would hold down the other edge.
I think it could be used to mount a number of things, but am wondering if anyone knows it's original purpose. I don't think it is very old. It's about a square foot or a bit more in size and sits about 3 or 4 inches high from the surface. Any ideas?
Right side up:

Upside down:

[stanley62]

Base for a washing machine?  I took one apart for the drum (great camping firepit) and it was attached to a structure similiar to your picture.
  Jim

[kxxr]

as good a guess as any I've got. I don't know, seems kind of small for that. It only measures about 14 x 14 inches if that.

[walker]

looks like a motor mount to me,maybe washing machine.
brian

[kxxr]

That's 2 for washing machine, thanks guys. Still wondering though. This was at a little old lady's garage sale and the next closest thing she had to a tool was a wheel barrow.

[keykeeper]

Not sure for what, but definitely an anti-vibration/shock absorber type of mounting bracket or base.

I've been curious since I read this thread this morning.

[kxxr]

Looks made to mount and unmount whatever goes on it quickly and easily.
It is sturdy construction but much care and extra machining was done to keep the weight down I guess. It is not cast iron as I thought, but aluminum (a magnet won't stick to it anyway). It tips my fish scale to 2.5 pounds and measures 13 x 14 inches.
Why would it need to be so light weight. I first thought maybe less mass = less heat retention, but couldn't they just put fins on as a heat sink if that were a concern? Does it go on something made to go fast?
I wasn't smart enough to ask the lady what the thing was for but I just had a feeling she wouldn't know anyway. Would have been worth a try. Dumb.