OA Images does not currently picture the S3b and S3c varieties from Gajuka Lodge #477. The S3a has a cloth back, and both the S3b and S3c have plastic backing. The Blue Book describes them as:
S3b TAN R M/C DBL GMY FDL; PB; 112x53mm
S3c DTN R M/C DBL GMY FDL dark tan border, 112x53mm PB
The difference is in the shade of tan on the border. The two varieties are pictured below.
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