OK, well here's the only other pic and not sure what use ID-ing this will be but...doesn't look much different from a Tange (which could also be a Shimano made by Tange) however as to an exact model: I'd only be guessing.

if your goal is to install a new HS you can't beat a Tange Levin as long as the stack-height works with this fork and the Puch's head tube.
Just be sure to buy one with the 26.4 crownrace (they also come with 27.0)


just to get you in a ballpark, the standard steel Tange Levin stackheight (per Sutherlands) is 37.5
the Shimano 105 (HP1050) is 32.7
If you don't know how to compute what stackheight you need consult Sheldon Brown (or maybe somebody here has made a Wiki)