only the second double mark on the housing from the factory... I have had other axles that have lockers, etc. that someone else put in there, but as for the stamping, I think it is only the 2nd one out of quite a bit.
It is a paint stripped you can buy at Lowe's... not as good as the old stuff that had better chemicals in it, but it does the job... sometimes 2 applications... not cheap either... needs lke 4 cans @ 13 bucks now... so it is $50 to strip them... dismounting I was charged $45 for removal of the tires and disposal, not to mention the time to the tire place and Lowes, so now I am $100 more into these... but in the end, they will look a lot better than they were and hopefully bring more $$$$
These are mostly stripped now... there is some stubborn coating on a couple of them, and I ran out of striped
4 cans to do it to this point... need one more probably, then some #0000 steel wool, then the Mothers Ball and chrome polish... .then I have to get the bolts out of hte center caps and polish them out... it is a ton of work, but the chrome on these are nice.
There are a few rust spots, and the typical pitting, but all in all, they will show very nicely on a daily driver.
A few things... first, this is a honey dashpad, probably up there with the rarest of dash pads... second, I am going through a ton of time/effort to remove the paint to get to the honey dash pad... so it will never be painted on my watch.
Kidding aside, I would have not bought it and tried to bring it back if I was going to paint it... you can buy a brand new one and dye/paint it and save yourself a lot of time and money.
I have written numerous times in many threads on what it takes to do this... essentially it is a science experiment as you have no idea what they used to paint the black on it, so you need to dig into your bag of tricks and figure out what cleaner/degreaser/stripper/etc. will best do the job and most importantly, you can't rush it... go slow.