I Don't exactly know where that scope were in that picture, but description said about it helping on dive bombing like was it about 45 degrees or some.
It was on the side of cockpit, didn't see anything too intresting myself though.
It was enough new for me that I did memorize it

Meant of it was to help pilot see target more clearly through nose.
I Guess it was some german made, at least it was 109G6, quite fresh one.