Additionally I have found 508 detailed and pictured here

http://www.psywar.org/apddetailsdb.php?detail=1941EH508

And 515 here

http://www.psywar.org/apddetailsdb.php?detail=1941EH515

And the third small one is actually 494, as here

http://www.psywar.org/apddetailsdb.php?detail=1941EH494

The big one is not on the website.