Stamping Mystery

Hi Guys. I have a cable shift 727 in the shop for overhaul. After cleaning up the housing I discovered this Maltese Cross stamped into the extension housing flange where it is bolted to the main housing.

I have seen this many times on big block engine pads but never on a transmission.
Can anybody shed some light onto the meaning of this stamping? I didn't see it mentioned in Carl Monroe's Torqueflite Handbook.
Many thanx in advance. Gaz

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