No problems! I also find if you search the gallery for "brass ender" or some variation of brass and and some other search term, you can turn up a few extra ones especially the ones that are not Mazda branded (as an aside its very interesting to read that Mazda was banned as a brand/name? I never knew it was banned, do you know why that was? I always thought they just decided to stop using it!)
for example here are a couple I see that are not on the list so to speak
https://www.lighting-gallery.net/gallery/displayimage.php?pos=-231387https://www.lighting-gallery.net/gallery/displayimage.php?pos=-86505(BTW I would recommend using the direct link URL when linking to the gallery rather then the "
https://www.lighting-gallery.net/gallery/displayimage.php?album=" type of link you get if you copy from the URL bar when browsing, sometimes those links can fall out of position and end up linking to different picture in the same gallery and also the direct URL links are a bit shorter/neater
)
I look forward to hearing what you dig up on the patents front, I did think I should post it since I have been wondering if it is quite early relatively speaking since some of the colours just say Patent pending without any patent numbers even, so I do wonder if this dates it to 1939 rather then 1940? and perhaps could help us narrow down when the etch styles changed maybe? but thats just idle thoughts, hopefully the actual patents will give us a more concise data and also provide you with more juicy technical details for your own research