For sure the 19A1 models are as follows
19A11 = checkerboard brown
19A12 = checkerboard black (ebony)
I'm pretty sure the 17T1 models are similar
17T11 = Chinese brown
17T12 = Chinese black
The 19A1s were made in 1948-49 and the 17T1s only in 1949 and definitely less common.
I don't what the basketweave is unless the maple wood 19A15 as you speculated.
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