While I ultimately agree its more likely this particular silver pocketknife may have been made later than the 1950s (although its possible it was) the statement that Israel had no manufacturing companies in the early 1950s I don't think is quite accurate. While at risk of sounding argumentative (which is not my thought here just doing some research) in 1936 before Israel was even recognized as the State of Israel, they had 1,500 factories employing 30,000 people. From the establishment of Israel in 1948 through through to 1960 there were 25,000 manufacturing establishments in Israel. Even taking into the account the majority of these establishments were 1 man shops, by 1952 almost 100,000 people were employed in Israel and that number was 225,000 by 1965 all figures solely related to manufacturing companies.
Hazorfim is a leading silversmith company in Israel and has been since 1952. While unlikely this company made the pocketknife, this firm and many others were existent before Israel became the State of Israel and have continued to this day.