One last post for the evening, sorry. The Skeleton Army marched under a banner with a Skull with Crossbones. Their motto was Blood and Guts/Thunder. "'Skeletons' used banners with skulls and crossbones; sometimes there were two coffins and a statement like, “Blood and Thunder” (mocking the Salvation Army's war cry "Blood and Fire") or the three Bs: “Beef”, “Beer” and “Bacca” - again mocking the Salvation Army's three S's - "Soup", "Soap" and "Salvation".[Charles Jeffries Wikipedia]
This is a Ripper letter from October 9, 1888. Notice the Skull and Crossbones, the word BLOOD spelled out, a coffin and a skeleton drawn to the right. Coincidence? Or from Bachert? Bachert was an Art engraver and would be talented with drawing skills I would think. The messy writing doesn't match the somewhat artistic drawings.
Great spot, I like your thinking. It all seems to fit....except that, according to Letters from Hell, this letter was posted in Birmingham - did Bachert have any connections there?