John -

A 1934 Brades catalog here -

https://archive.org/details/WilliamHuntAndSonsExportCatalogue1934/page/n25

The images aren't the clearest and I'm a bit foggy myself as to what this
tool looks like, but take a look at the page with plaster trowels and
pointers.  Are the tools in the lower left what you have?

Phil