Certainly the chambering is 7.65, but the pistol shown appears to be a SACM 35 (model 1935A), NOT an MAS 35 (model 1935S) https://unblinkingeye.com/Guns/F1935S/F1935A01/f1935a01.html
NO…. it is a French model 1935 designed by Charles Petter. Elements of the design were later licensed to Sig, which is why it looks a lot more like a Sig 210 than a Browning. (Good research by the cartoonist…note the slide is inside the frame like a Sig, rather than outside as in a Browning )
For the middle of a fight, Sam certainly switches weapon hands a lot… During this whole series he has been rather ambidextrous .