We've talked about the JPD adjustables many times before. When they were
forged is indisputable. When they were
stamped is not.
I have the same catalog on my hard drive, Don, down-loaded from the old TA years ago. That copy has a PL in the back. (Still not sure why all the old TA cats aren't on IA/ITCL, but that's another story.) Not sure what you mean by "conventional," but the only difference between Catalog 4820 and Catalog 4922-M is removing the Plomb Tool Company name from the flying lady logo on page 2. Plomb Tool Company appears on the bottom of the page instead. It also appears on the back cover. Catalog 4820 had already separated the names on the covers, every page, and the back cover. The only place Proto and Plomb Tool Co appear together in Cat 4820 is the flying lady logo and that's the only change from 4820 to 4922-M. Note that all the tool pages are identical and that none of the images of any tools have any markings, which is also true for a copy of Cat 4922-M that
@Catfishdan owns with a PL dated March 1950.
Here is the 100% fact-based timeline from the tail end of my research and analysis, which can be found fully documented and discussed
here.
- In March 1947 Plumb sued Plomb in an L.A. Federal district court and won; Plomb had a year (or until March 1948) to stop using its name as a trademark.
- On February 2, 1948, Plomb applied for a ‘PRVTV’ TM. The TM application was
only for paper (catalogs, ads, tags, packaging, decals, etc).
(Note: AA completely misses this detail and uses this 'first use' date for the dual-marked tools, the erroneous source of a cascading system of flawed logic on their part.)
- On July 13, 1948, Plomb was awarded the ‘PRVTV’ TM, approved
only for paper.
- In October 1948, Plomb started running ads consistent with their on-paper-only 'PRVTV' TM application, consistent also with Cat 4820.
- On November 16, 1948, Plumb sued Plomb again for contempt, and the court ordered Plomb to comply with the previous March 1947 order, and to pay Plumb any profits it made during the year after March 1948 (the date it was supposed to have complied by).
- In December 1948, Plomb closed down their plant to re-tool for a solution to the November 16, 1948 contempt lawsuit that Morris Pendleton called a temporary expedient estimated to cost $130,000.
- On December 14, 1948, Plomb applied for a ‘PROTO’ TM that it intended to use on paper
and tools.
- In early January 1949, Plomb re-opened.
- Plumb immediately sued again. On January 13, 1949, Plomb lost, again, and Plomb was given until March 1950 to fully comply with the previous March 1947 court order to cease and desist using “Plomb” as a trademark.
- Throughout 1949 Plomb embarks on a massive advertising and merchandising education and conversion blitz introducing ‘PROTO Tools’.
Without telling anyone else what to think (i.e., form your own positions and interpretations...), I think it's fairly obvious.
Plomb completely ignored the first suit for nearly a whole year. A month before their March 1948 deadline, they applied for a TM for Prvtv, added it to their catalog, and started plastering it on decals and packages etc - note, everything
except the tools themselves. A weak and hasty attempt to mollify Plumb. It didn't work. They shut down their plant over the holidays, reopened in 1949 with the expedient solution. What else could it be except the dual-marked tools?! Plumb and the courts were not impressed. They were given another year (until March 1950) to fully comply. While they were making and selling the dual-branded tools, they fully re-tooled across their plants to remove ‘Plomb’ completely, and that was Proto only LA.