I think you are barking not so much up the wrong tree as in the wrong forest
Bravo John :po: way to go!
I believe the red glass with the metal trim is actually German. Not sure who or how long or how many variants - but we seem to see rather a lot of them here. It was a popular colour in the 1930s - along with orange and opaque green. But only the ones with a contrasting trailing count as Tango.