Hello Walt, in re-examining your pictures this morning it appears to me that that the stub rib located between the lug and barrel flats is integral with the lug. LC Smith guns had the same treatment for their 3" and sometimes Trap grade guns. The treatment was a great way to prevent lug rotation in guns that were likely to be used hard or fire 3" shells. The height difference between the front and back of your lug appears to be a function of design, and if the stub rib is still securely attached, then your lug should be in its original position, provided the shiny solder we see is not an indication of a repair that wasn't properly positioned. I'd start looking at the fore-end as the culprit, as the lug looks ok.
Sorry to have gotten you off track!
Good luck,
John
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