Very Nice Massimo!
Just to follow up on the same line, here is one I might have posted in another thread before from the 2016 March 8 partial eclipse. I was very happy to capture it as we were right at the limit here in Fairbanks and it occurred just as the sun was setting so I was not sure it would be above horizon.
(Captured with the 300mm f/4 PF on the AW1. A Baader solar film based filter was used for the capture, which is about neutral - the color was not added but is the natural one at sunset with daylight white balance.)
There's a perfect duality in the two images: in mine, the sun is going up and catching up on the moon (upper R); in yours, the sun is going down and the moon is on lower L side.
Regarding the sun's size, I used a D300 + 300 mm/4 too (the old AF-D screwdriver type, manually focused), I didn't use any filter (had none at the time), but I had to resort to 1/6400 @f:8.
On your image the sun is bigger because the AW1 sensor is a little smaller than the D300's (DX).
Thanks everyone for the kind comments!
Ciao from Massimo