F Sanfew serum(4) - 181gp spread, range-bound PvM combat potion killed

Sanfew serum(4) clears a 181gp post-tax spread on 7.8k units/h of activity because PvM-combat demand for the 4-dose is steady and undercut flippers dump the 4-dose after decant, while patient healers place buys 1-2gp above mid. The 30d daily close series oscillates 18k-22k with very low drift (Jul 30 close 19776, Jul 31 close 19389 — ~2% downward bias but well within the 4k swing range). Both legs fresh at the live quote. The 30d width of 4k vs the current spread of 181gp is ~4.5% — the spread is the structural clearing premium, not a one-print.

Entry: Buy at 18821 or better; place offers 1gp increments
Exit: Sell at 19389 or better; cancel unsold buys if margin drops below 100gp for 2 consecutive 4h checks

Kill switch: Live margin drops below 100gp for 2 consecutive 4h checks, OR daily close drops below 18000 (lower band of the 30d range), OR PvM update rebalances super restore / sanfew combo. Stop is 18500 (below the 30d range bottom).

From run 437 · F-sanfew-serum4-20260731