Dick, thanks that helps. This is what I see, others may add. Pic one shows the holes from a grenade launcher sight and some srimshaw. Pic two is the Underwood post war rebuild stamp. Pic three is new to me, not like the Israeli stamps I have seen. The serial number stamped on the left near the slingwell is consistant with the IDF carbines. How about a full serial number and a pic of the slingwell.
Regards.....Frank