9" rear assembly for sale

Strange Aluminum housing, 3.73 gears, locker I took it on a trade awhile back so don't have the paperwork) 31 spline, never used.
$1200.00

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P.S. if anyone knows how to identify the style of locker please post so I can clarify that, I've debated not even posting it for sale because I didn't have that critical bit of info... I would like to identify the locker style for any potential purchasers

and I based price off what the guy I traded paid for it (1800), but if you think I'm too high feel free to shoot me an offer and maybe we can work something out.