http://cgi.ebay.co.uk/WESTLAND-WESSEX-HELICOPER-SUPERVISOR-PHOTOGRAPHS-3_W0QQitemZ290345841953QQcmdZViewItemQQptZUK_Collectables_Aeronautica_MJ?hash=item4399f5f521&_trksid=p3911.c0.m14 Possibly some kind of radar dish?