Thanks Peter but this is more compicated and on this stamp it is not easy to determine type. 5 on 7 1/2 with arow in front of arow is not exist. It's two types 5 on 7.5 with arrow behind the arrow. Second type is very rare and valuable.
I am pretty sure it is still type II. The "F" of Nafels is in a rotten place, but if the stamp was type III there would be some white showing above this "F". On your picture I do not see any evidence of white there.
I am no expert but reading from scott catalog I would say that this is from the second reprint but Type I
text from Scott
Second Redrawing Bow-string behind stock. Thick loop above crossbow. Letters of "HELVETIA" have serifs.
7&1/2 CENTIMES: Type I — Top of "7" is 1/2mm thick. The "1" of " 1/2" has only traces of serifs. The two base plates of the statue are of even thickness. Type II — Top of "7" is 1mm thick. The "1" of " 1/2" has distinct serifs. The upper base plate is thinner than the lower.