diff --git a/release-notes/CREDITS b/release-notes/CREDITS
index 7bd5b91e19..96d20ea5cf 100644
--- a/release-notes/CREDITS
+++ b/release-notes/CREDITS
@@ -397,3 +397,7 @@ Shumpei Akai (flexfrank@github)
 Hugo Wood (hgwood@github)
   * Contributed #1010: Support for array delegator
    (2.7.0)
+
+Julian Hyde (julianhyde@github)
+  * Reported #1083: Field in base class is not recognized, when using `@JsonType.defaultImpl`
+   (2.7.1)
diff --git a/release-notes/VERSION b/release-notes/VERSION
index d0bda25a8b..706160a70c 100644
--- a/release-notes/VERSION
+++ b/release-notes/VERSION
@@ -7,6 +7,8 @@ Project: jackson-databind
 2.7.1 (not yet released)
 
 #1079: Add back `TypeFactory.constructType(Type, Class)` as "deprecated" in 2.7.1
+#1083: Field in base class is not recognized, when using `@JsonType.defaultImpl`
+ (reported by Julian H)
 
 2.7.0 (10-Jan-2016)
 
diff --git a/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/TypeDeserializerBase.java b/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/TypeDeserializerBase.java
index 57952007f2..bcd35e2b5f 100644
--- a/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/TypeDeserializerBase.java
+++ b/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/TypeDeserializerBase.java
@@ -74,8 +74,8 @@ protected TypeDeserializerBase(JavaType baseType, TypeIdResolver idRes,
         // 22-Dec-2015, tatu: as per [databind#1055], avoid NPE
         _typePropertyName = (typePropertyName == null) ? "" : typePropertyName;
         _typeIdVisible = typeIdVisible;
-        // defaults are fine, although concurrency of 4 bit more frugal than 16:
-        _deserializers = new ConcurrentHashMap<String, JsonDeserializer<Object>>(16, 0.75f, 4);
+        // defaults are fine, although shouldn't need much concurrency
+        _deserializers = new ConcurrentHashMap<String, JsonDeserializer<Object>>(16, 0.75f, 2);
         if (defaultImpl == null) {
             _defaultImpl = null;
         } else {
@@ -84,6 +84,8 @@ protected TypeDeserializerBase(JavaType baseType, TypeIdResolver idRes,
              *    seldom (if ever) base types, may be ok.
              */
             // 01-Nov-2015, tatu: Actually this is still exactly wrong. Should fix.
+            // 15-Jan-2016, tatu: ... as witnessed by [databind#1083], patched, but
+            //     fundamentally this call can't be made to work for all cases
             _defaultImpl = baseType.forcedNarrowBy(defaultImpl);
         }
         _property = null;
diff --git a/src/main/java/com/fasterxml/jackson/databind/type/SimpleType.java b/src/main/java/com/fasterxml/jackson/databind/type/SimpleType.java
index bd2ad0049d..1c741ec9fa 100644
--- a/src/main/java/com/fasterxml/jackson/databind/type/SimpleType.java
+++ b/src/main/java/com/fasterxml/jackson/databind/type/SimpleType.java
@@ -123,7 +123,16 @@ protected JavaType _narrow(Class<?> subclass)
             return this;
         }
         // Should we check that there is a sub-class relationship?
-        return new SimpleType(subclass, _bindings, _superClass, _superInterfaces,
+        // 15-Jan-2016, tatu: Almost yes, but there are some complications with
+        //    placeholder values, so no.
+        /*
+        if (!_class.isAssignableFrom(subclass)) {
+            throw new IllegalArgumentException("Class "+subclass.getName()+" not sub-type of "
+                    +_class.getName());
+        }
+        */
+        // 15-Jan-2015, tatu: Not correct; should really re-resolve...
+        return new SimpleType(subclass, _bindings, this, _superInterfaces,
                 _valueHandler, _typeHandler, _asStatic);
     }