diff --git a/library/packet/countrySheet.js b/library/packet/countrySheet.js
index c0243e71f..65b89377a 100644
--- a/library/packet/countrySheet.js
+++ b/library/packet/countrySheet.js
@@ -1,7 +1,8 @@
 /**
  * countrySheet.js — a country's map sheet, GENERATED in the browser at the click.
  *
- * SHARED (@map/packet/countrySheet.js). Its caller is the regions dashboard's regions-list.
+ * SHARED (@map/packet/countrySheet.js). Its callers are the regions dashboard's regions-list and the
+ * Country Posters wall (country-poster-wall.vue), which used to define its own inline copy.
  *
  * ⚠ THE MOVE HERE WAS NEVER FINISHED, and it cost a real defect. This module's comment used to claim
  * two consumers -- the country-poster wall and <doxa-country-map> -- and a CENSUS of the tree found
@@ -14,7 +15,8 @@
  * `country` without a region -- so countryRegionColor(undefined) returned the old flat teal and
  * warned. The same country then printed HUED from Country Posters and TEAL from the Regions tab,
  * which is exactly the "two different posters for one country" the hue change exists to refuse.
- * The copy is deleted and regions-list imports this. Do not re-copy it: a duplicate of this file is
+ * The copy is deleted, and regions-list and the wall both import this (check:country-sheet-one-path
+ * refuses a caller that draws a country sheet any other way). Do not re-copy it: a duplicate of this file is
  * indistinguishable from it until one of them is edited, and then it is a silent divergence.
  *
  * The print standard is generate, store only previews: no country sheet is shipped, and none should
@@ -52,12 +54,16 @@
  * not introduced by the one-definition change: the plugin-local copy regions-list used before it
  * passed no series either. The wall was never affected because it computes its own.
  *
- * Returns undefined when the item has no sheet tier, so a row without a poster keeps the renderer's
- * own default rather than a fabricated position.
+ * Returns undefined when the item is not in the list (a host's country with no poster), so that row
+ * keeps the renderer's own default rather than a fabricated position.
+ *
+ * A null sheet is a tier too: India (sheet null, too many groups for any paper size) is its own
+ * 1-of-1 series. Skipping it printed "map 1 of 0" on India's packet page 1 from the Regions tab
+ * while the wall's own copy printed "map 1 of 1" -- the two paths disagreeing again.
  */
 export function seriesFor(countries, item) {
-  if (!item || !item.sheet || !Array.isArray(countries)) return undefined
-  const tier = countries.filter((x) => x.sheet === item.sheet)
+  if (!item || !Array.isArray(countries)) return undefined
+  const tier = countries.filter((x) => (x.sheet ?? null) === (item.sheet ?? null))
   const index = tier.findIndex((x) => x.id === item.id) + 1
   if (!index) return undefined
   return { totalGroups: tier.reduce((a, x) => a + (x.count || 0), 0), totalLists: tier.length, index }