I thought the seat binder and deraileur cable guides were added but after looking at photos of "Stronglight's" Bob Jackson, I now believe I misremembered that. I believe I was thinking of this bike's predecessor which had a Campagnolo binder bolt and a Campagnolo clamp-on cable guide.

The water bottle bosses are add-ons. The shift lever braze ons were definitely added because the original clamp stop is still on the frame. As this item is underneath the down tube, it is unobtrusive and does not need to be removed.

I was considering a repaint because there are many places where the rust has gotten underneath the paint and the rust is spreading laterally.