I have a first generation numbers matching Astra 400. It's a Spanish Army gun issued during the Spanish Civil War. It is one of my favorite guns in my collection. But, it is 9mm largo.
One other I must give honorable mention to .... There is sentimental attachment as wellFavorite ...hmmmm for carry ? SIG 365
for History ? P08 1917 Erfurt Luger recovered in Falaise (Normandy, France) Aug. 1944
and a bring back Mauser P38.