Lowest Serial $5 SC #637 Mules?

What is the lowest serial number known on a $5 SC #637 BP Mule? The normal micro back plate Mules ended very early into the 1934A H-A block and the LFBP #637 Mules began in the later part of the K-A block.

BP #637 first went to press on June 23, 1945, and the K-A block serial range printed in 1945 was K65984001A - K84284000A, with the lowest serial immediately following the North Africa printing. This is the lowest $5 SC #637 Mule I’ve seen (K70540257) and am curious if anyone has a record of anything lower.

I don't have anything lower than that, and that is probably about as low as it gets.