diff --git a/coinmanager/coinc/models.py b/coinmanager/coinc/models.py
index 0fb7a6f..fd7bfeb 100644
--- a/coinmanager/coinc/models.py
+++ b/coinmanager/coinc/models.py
@@ -20,7 +20,7 @@
 
 from datetime import datetime, date
 
-from django.db.models import BooleanField, CASCADE, CharField, DateField, ForeignKey, Model, PositiveIntegerField, PositiveSmallIntegerField, TextField
+from django.db.models import BooleanField, CASCADE, CharField, DateField, DateTimeField, ForeignKey, Model, PositiveIntegerField, PositiveSmallIntegerField, TextField
 
 
 year_now        = int(datetime.now().year)
@@ -85,6 +85,10 @@ class Coin(Model):
 
     found_on        = DateField('Eingetragen am', default=date.today)
 
+    date_added      = DateTimeField('Hinzugefügt', auto_now_add=True)
+
+    date_modified   = DateTimeField('Geändert', auto_now=True)
+
     circulation     = PositiveIntegerField('Auflage', default=0)
 
     buy_only        = BooleanField('Kursmünze', default=False)
diff --git a/coinmanager/coinc/views.py b/coinmanager/coinc/views.py
index ce70abe..1311076 100644
--- a/coinmanager/coinc/views.py
+++ b/coinmanager/coinc/views.py
@@ -24,6 +24,7 @@ from django.conf import settings
 from django.http import HttpResponse, Http404
 from django.template import loader
 from django.template.defaultfilters import register
+from django.views.decorators.http import condition
 
 from .models import Country, Stamp, Coin, User
 
@@ -46,8 +47,16 @@ def coin_sum_of_(country):
             coin_count['total'] += 200 * coin_count[value]
         else:
             coin_count['total'] += value * coin_count[value]
-    coin_count['total'] /= 100
-    return coin_count['total']
+
+    return coin_count['total'] / 100
+
+
+def latest_coin_added_to_(request, name_iso):
+    ''' return the datetime of the last coin added to a country
+    >>> latest_coin_added_to_(germany)
+    datetime.datetime
+    '''
+    return Coin.objects.filter(country=name_iso).latest('date_modified').date_modified
 
 
 def index(request):
@@ -66,6 +75,7 @@ def index(request):
     return HttpResponse(template.render(context, request))
 
 
+@condition(last_modified_func=latest_coin_added_to_)
 def detail_country(request, name_iso):
     ''' wrapper_view for a *single* country '''