Stunning! Could be a passoni maybe?
I've never seen welds that smooth on a ti frame before. Are they just filed/sanded right back or something? Every ti frame I've seen has noticable 'blobs' for lack of a better word.
filler perhaps.
Don't know tbh, I just googled vintage titanium bike and found those pics. Doesn't look like filler tho.
@Colonel_of_Truth started
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Stunning! Could be a passoni maybe?