Originally Posted by
Kuromori
<snip> the mix between the tiny Routens brass fillets and the big non-brass fillets was so conspicuous.
Routens big headtube fillets were brass on at least this one (stripped) frame:
https://flic.kr/p/dknCN5 I assume probably others as well.
Here's an excellent blog with lots of pics of a stripped Routens with some joints brazed (small fillets) and some gas-welded:
https://vintagebicycle.wordpress.com...-c-1948-naked/
Mark B