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That is a very nice looking hollow ground razor.
I looked in Goins Encyclopedia of Cutlery Markings
and Shehab is not listed.
Other than protracted internet searches, that is the extent of my reference sources.
I was not aware that, at times, the "H" had been dropped from Pittsburgh. Interesting.
Hopefully, one of our straight razor collectors or aficionados will come along with some definitive information.