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Martin didn’t switch to scalloped bracing until 1945, so unless it’s some odd Frankenstein guitar that has had its bracing replaced, it should be scalloped.
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The change happened in late 1944.
#89426 is from late 1944. 1944 serial numbers range from 86725 to 90149.
The last scalloped guitars recorded by Martin were a batch of D-18's 89902-89926, but there have been unscalloped Martins recorded before that batch.
The large rosewood bridgeplate is not original. Martin did those from 1969 until the mid-1980's. It should be a small maple plate that is 1 3/8" wide.
There are other indications that point toward a retop:
The cloth reinforcement at the X crossing should be dark brown.
The top appears to be Sitka, rather than red spruce.
The bracing is straight, rather than tapered.