[ARC5] Identify, please?

[Kenneth G. Gordon]

I have several "boxes" here, which I cannot identify, all of which have 
never been used, and one of which, at least, is still in its original 
miliary packing.

They are aluminum, 5 1/2" long, by 4" high, by 1 3/4" deep. On "top" is a 
black metal plate with 4 holes in it. The plate can be slid to one side 
by loosening two screws uncovering the adjustment holes.

On this particular box which I am looking at, the adjustments are labled 
above the holes, from left to right, C-157, C-158, C-159, and C-160.

Below the adjustment holes, the plate is labled L-105 and RF-2.

The bottom of the box is labled L-124 and L-127. On either end of the box 
is an adjustment hole with what is obviously a screwdriver adjustment for 
L-124 and L-125.

Also on the bottom at one end are 5 "pins" in two rows insulated with a 
ceramic, which look as though they were meant to be soldered to after 
installation of the box.

Low and centered on each side is a hole through which, obviously, a band-
switch shaft must have passed.

There are also various ink-stamped markings all over the ends, one being 
a large letter "S" with a 7 and an M inside the upper and lower parts of 
the "S". There is also a date stamped, 2-4-53.

They are also somewhat heavy for their size.

I think I was told that these were for an ARB receiver, but I am not 
certain about that. Anyway, the receiver had 4 bands.

If anyone would like to see what this thing looks like, I will be happy 
to send some .JPGs of it from all six sides.

I would like to sell all of them for some reasonable price.

Ken W7EKB