Unfortunately, the pictures you submitted do not show the part numbers of the several adjustable pliers presented for verification.
During post-war DBAG production, a pair of adjustable pliers was supplied in many automotive tool kits. Sourced from a variety of manufacturers and bearing different markings and logos, the part number for such pliers was 000 581 01 38 regardless of changes in manufacturer, finish, markings, logo placement or jaw configuration. DBAG was not particular about these details as long as a pair of pliers was available for each tool kit nor did it keep track of when a specific product went in or out of supply.
The attached picture shows several examples supplied as original equipment during the 1950s and the 1960s, all under part number 000 581 01 38. This same part number continued well into the 1970s and perhaps beyond, well after the outer finish of the pliers had been changed to the silver with which we are all so familiar. This part number is often found embossed into one handle of the silver pliers together with the Mercedes star logo. The other handle carries the words "HEYCO" and "Germany." The best anyone can do to determine originality is to attempt a consensus from other owners as to how their cars were equipped.
Remember, the words "always" and "never" should not be used when discussing authenticity.