I was cleaning up the trans and got started on the motor bar to have it ready when the engine is done. To my amazement I found the number 63 stamped on the bottom of the motor bar. This is the first time I have ever seen one here. Has anybody else seen this one before?

Please take a pic of the full bar showing the stamp.

Never. That's cool!

Added 3 more pictures.

Get some tracing paper & trace it so you can replicate the 63 mark after you finish refinishing the bar if you want to maintain originality. If not, it's cool that you documented it.