Any ID possibly??

[Medbury Gardens]

I know how difficult it is to identify tomatoes, but i thought its worth a try any way.
I was given seed of about 10 different tomatoes by a lady who's husband had recently died,he had been on a garden tour to my place a year or so earlier and had said to his wife that he would like me to carry on growing them.Unfortunately all but nine were only named as big red,small red, etc etc but there was one that had the name on the packet as "First Lady",this was the only one i grew,ive tried doing searches on that name but nothing seems to come up.


I found it to be a very vigorous growing plant that has ended up growing mid sized fruit which have now started to ripen,as you can see its white/yellow tomato.

Anyone recognize it???