diff --git a/custom_components/localthings/entity.py b/custom_components/localthings/entity.py
index 84501b4..634f631 100644
--- a/custom_components/localthings/entity.py
+++ b/custom_components/localthings/entity.py
@@ -43,7 +43,11 @@ def _derive_name(state_key: str) -> str:
     Strips a trailing instance number of 0 (singleton), promotes any other
     instance number with a space: "door_cooler_open1" → "Door Cooler Open 1".
     """
-    name = re.sub(r'(\d+)$', lambda m: f' {m.group()}' if int(m.group()) > 0 else '', state_key)
+    name = re.sub(
+        r'_?(\d+)$',
+        lambda match: f' {match.group(1)}' if int(match.group(1)) > 0 else '',
+        state_key,
+    )
     return _snake_to_title(name).strip()
 
 
diff --git a/custom_components/localthings/select.py b/custom_components/localthings/select.py
index c85cc95..2b0c62b 100644
--- a/custom_components/localthings/select.py
+++ b/custom_components/localthings/select.py
@@ -129,8 +129,14 @@ def _display(value, translation_key: Optional[str]):
     """
     if not isinstance(value, str):
         return value
-    if translation_key and (translated := _translation_state(value, translation_key)):
-        return translated
+    if translation_key:
+        if translated := _translation_state(value, translation_key):
+            return translated
+        if translation_key not in TRANSLATED_SELECT_STATES:
+            # The entity name is translated, but this select deliberately has
+            # no static state catalog (for example an unknown course table).
+            # Keep its opaque device value untouched.
+            return value
     if value.islower():
         return value.replace('_', ' ').title()
     return _CAMEL_BOUNDARY_RE.sub(' ', value)
diff --git a/custom_components/localthings/strings.json b/custom_components/localthings/strings.json
index 412cec0..c3860aa 100644
--- a/custom_components/localthings/strings.json
+++ b/custom_components/localthings/strings.json
@@ -488,6 +488,9 @@
       "filter_progress": {
         "name": "Filter progress"
       },
+      "filter_usage": {
+        "name": "Filter usage"
+      },
       "fine_dust": {
         "name": "Fine dust"
       },
diff --git a/custom_components/localthings/translations/en.json b/custom_components/localthings/translations/en.json
index 412cec0..c3860aa 100644
--- a/custom_components/localthings/translations/en.json
+++ b/custom_components/localthings/translations/en.json
@@ -488,6 +488,9 @@
       "filter_progress": {
         "name": "Filter progress"
       },
+      "filter_usage": {
+        "name": "Filter usage"
+      },
       "fine_dust": {
         "name": "Fine dust"
       },
diff --git a/custom_components/localthings/translations/nl.json b/custom_components/localthings/translations/nl.json
index 05510d0..4998fdd 100644
--- a/custom_components/localthings/translations/nl.json
+++ b/custom_components/localthings/translations/nl.json
@@ -488,6 +488,9 @@
       "filter_progress": {
         "name": "Filterverbruik"
       },
+      "filter_usage": {
+        "name": "Filtergebruik"
+      },
       "fine_dust": {
         "name": "Fijnstof"
       },
diff --git a/tests/test_select_display.py b/tests/test_select_display.py
index 3476c9a..a3e5ee3 100644
--- a/tests/test_select_display.py
+++ b/tests/test_select_display.py
@@ -2,7 +2,7 @@
 from custom_components.localthings.select import _display
 
 _UNTRANSLATED = None
-_TRANSLATED = 'door_alert'
+_TRANSLATED = 'ice_type'
 
 
 def test_display_titlecases_a_fully_lowercase_device_native_token():
diff --git a/tests/test_select_options.py b/tests/test_select_options.py
index 6a64719..b318a95 100644
--- a/tests/test_select_options.py
+++ b/tests/test_select_options.py
@@ -49,7 +49,7 @@ def test_callable_options_receives_full_resource_snapshot():
         '/other/vs/0': {'codes': ['1C', '1D']},
     }
     entity = _make_select(desc, '/x/vs/0', resources)
-    assert entity.options == ['1c', '1d']
+    assert entity.options == ['1C', '1D']
     assert calls == [resources]