[stugumby]

This is what has me confused: in your excellent picture of that gleaming P-51B?C (im not sure of the -10-15 etc) it dosnt have the added on dorsal fin fillet i was asking about. but your sig picture has one with a malcom hood and fin fillet, thats the version i was asking about. It is my understanding that this came about in mar/apr 1944 and was retroactively fitted in the field. My personal research books etc were limited to squadron signal books that have been negligently tossed by well meaning wife so im far from an expert in P-51 types /subversions etc.

But thank you again for steering me into further avenues of learning.