diff --git a/application/models/Dxcluster_model.php b/application/models/Dxcluster_model.php
index 3033af399..03fbcce0b 100644
--- a/application/models/Dxcluster_model.php
+++ b/application/models/Dxcluster_model.php
@@ -249,11 +249,25 @@ class Dxcluster_model extends CI_Model {
 					$spot->cnfmd_continent = $status['cnfmd_continent'];
 					$spot->worked_continent = $status['worked_continent'];
 
-					// Use batch last_worked data
-					if ($spot->worked_call && isset($last_worked_batch[$callsign])) {
-						$spot->last_wked = $last_worked_batch[$callsign];
-						$spot->last_wked->LAST_QSO = date($custom_date_format, strtotime($spot->last_wked->LAST_QSO));
+				// Use batch last_worked data
+				if ($spot->worked_call && isset($last_worked_batch[$callsign])) {
+					$spot->last_wked = $last_worked_batch[$callsign];
+
+					// Validate and convert date safely to prevent epoch date (1970) issues
+					if (!empty($spot->last_wked->LAST_QSO)) {
+						$timestamp = strtotime($spot->last_wked->LAST_QSO);
+						// Check if strtotime succeeded and timestamp is valid (> 0)
+						if ($timestamp !== false && $timestamp > 0) {
+							$spot->last_wked->LAST_QSO = date($custom_date_format, $timestamp);
+						} else {
+							// Invalid date - remove last_wked to prevent displaying incorrect date
+							unset($spot->last_wked);
+						}
+					} else {
+						// Empty date - remove last_wked
+						unset($spot->last_wked);
 					}
+				}
 				} else {
 					// Fallback for spots without status
 					$spot->worked_dxcc = false;
diff --git a/application/views/bandmap/list.php b/application/views/bandmap/list.php
index 60ad3967f..6ba3dd76f 100644
--- a/application/views/bandmap/list.php
+++ b/application/views/bandmap/list.php
@@ -117,15 +117,16 @@
 						</div>
 						<!-- Column 2: Required Flags and Additional Flags -->
 						<div class="mb-3 col-12 col-sm-6 col-md-4 col-lg">
-							<label class="form-label d-block filter-label-small" for="requiredFlags"><?= __("Required Flags"); ?></label>
-							<select id="requiredFlags" class="form-select form-select-sm filter-short" name="required_flags" multiple="multiple">
-								<option value="None" selected><?= __("None"); ?></option>
-								<option value="lotw"><?= __("LoTW User"); ?></option>
-								<option value="newcontinent"><?= __("New Continent"); ?></option>
-								<option value="newcountry"><?= __("New Country"); ?></option>
-								<option value="newcallsign"><?= __("New Callsign"); ?></option>
-								<option value="Contest"><?= __("Contest"); ?></option>
-							</select>
+						<label class="form-label d-block filter-label-small" for="requiredFlags"><?= __("Required Flags"); ?></label>
+						<select id="requiredFlags" class="form-select form-select-sm filter-short" name="required_flags" multiple="multiple">
+							<option value="None" selected><?= __("None"); ?></option>
+							<option value="lotw"><?= __("LoTW User"); ?></option>
+							<option value="newcontinent"><?= __("New Continent"); ?></option>
+							<option value="newcountry"><?= __("New Country"); ?></option>
+							<option value="newcallsign"><?= __("New Callsign"); ?></option>
+							<option value="workedcallsign"><?= __("Worked Callsign"); ?></option>
+							<option value="Contest"><?= __("Contest"); ?></option>
+						</select>
 							<label class="form-label d-block filter-label-small mt-3" for="additionalFlags"><?= __("Additional Flags"); ?></label>
 							<select id="additionalFlags" class="form-select form-select-sm filter-short" name="additional_flags" multiple="multiple">
 								<option value="All" selected><?= __("All"); ?></option>
diff --git a/assets/js/sections/bandmap_list.js b/assets/js/sections/bandmap_list.js
index 487bd689a..cde8f2f03 100644
--- a/assets/js/sections/bandmap_list.js
+++ b/assets/js/sections/bandmap_list.js
@@ -863,6 +863,9 @@ $(function() {
 				if (reqFlag === 'newcallsign') {
 					if (single.worked_call !== false) return;  // Only new callsigns
 				}
+				if (reqFlag === 'workedcallsign') {
+					if (single.worked_call === false) return;  // Only worked callsigns
+				}
 				if (reqFlag === 'Contest') {
 					if (!single.dxcc_spotted || !single.dxcc_spotted.isContest) return;
 				}
@@ -1319,6 +1322,9 @@ data[0].push((single.dxcc_spotter && single.dxcc_spotter.cqz) ? single.dxcc_spot
 					if (reqFlag === 'newcallsign') {
 						if (spot.worked_call !== false) return;
 					}
+					if (reqFlag === 'workedcallsign') {
+						if (spot.worked_call === false) return;
+					}
 					if (reqFlag === 'Contest') {
 						if (!spot.dxcc_spotted || !spot.dxcc_spotted.isContest) return;
 					}