Original, aftremarket or shadetree?

My '51 came with a hitch that looks pretty sturdy (mounts to the frame and bumper), not sure if its safe to use tho.

http://farm6.static.flickr.com/5187/5548009017_d7f7515fce_b.jpg
http://farm6.static.flickr.com/5179/5548010395_1563c22597_b.jpg
http://farm6.static.flickr.com/5095/5548593984_cfd39f0ac4_b.jpg
http://farm6.static.flickr.com/5179/5548587334_31bdb39fa5_b.jpg

Anyone know if there were manufacturer or dealer available hitches for the '51 3100?

Initially I wanted to move the current rear mounted front bumper to the front since the chrome is better and get an actual rear bumper for the back but I'm not sure that the flatter rear bumper will fit with the hitch. Which leads me to believe the hitch is homemade.
The tail lamp brackets look all wrong too, as the lamps sit way too low for a 51 and right angle on the bracket sits between the plate bracket and lamp mount instead of below.
http://farm6.static.flickr.com/5139/5548001609_4c8760f68b_b.jpg

If its a DIY from a farmer decades ago, its nice, as there's a plate lamp socket on the hitch where it mounts to the bumper to go with the plate mounting holes below the gate.
http://farm6.static.flickr.com/5066/5548000405_a363cd2bf9_b.jpg

...kinda leads me to think it might be original or old aftermarket. ...but then why the front bumper on the rear???