By the end of the SLQ run (28-30) the master hub for Denver SLQ's was plain worn out, with 1929-D being known in particular for some depressingly poorly struck coins when compared to San Fran & Philly. In addition, this set of dies was very worn and the coin was struck unevenly as well (look at the rims!) My guess would be a combination of
Machine Doubling (note the doubled profile of the eagle in general) and re-engraving of the feathers. This is a very late die state.
Combine a worn-out master hub with worn-out dies, die misalignment, and what looks like
Strike Doubling and possibly some re-engraving on the dies, and this is probably what you'd end up with.
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