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· Registered
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Welcome to the forum. The markings indicate STD. At the front it looks like an STD identification number and the markings at the back are abbreviated versions of that.

Sometimes the letters STD were cast-in. On the left case they were sometimes on a small boss above the timing plug hole. But some STD left cases had a different boss in that position and it was big enough to accommodate a Harley-style serial number.

On R-H cases the letters STD are sometimes under the ID number and sometimes they are above it as per the example below.

Maybe the letters were removed from your cases or perhaps they were never there in the first place? Try contacting STD to see if they have a record of your ID number.

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