Does it tell the date of manufacture or any other useful information? Are there separate series of numbers for car and truck axles? The particular unit in question is car axle #170117.
This Ruckstell data plate is from my TT. It's different than the ones the venders sell, so perhaps the TT had its own design. I'm sure someone will set me straight...
I think that the serial number plates for 1925 and earlier are rectangular and the 1926 and later are clipped.
As you can see, the plates with the clipped corners are made by Eaton Axle. They made both styles of axle housings. Mike Spaziano just had some of these made from an original plate I gave to him, and they came out quite nice. I believe this style of plate came out in 1925, probably the year Eaton purchased the manufacturing rights from Ruckstell. I like these housings, because Eaton worked out a deal with Ford, where they purchased the backing plates from Ford. Why do I like them? Because you can replace the brake cam bushing.