Mal, the thing these days is that there are folk who regard
this vintage stuff as currency, like antiques, old masters,
even gold. Like you I once bought T1154s for a song, and
broke them up for bits, never thinking that rarety would
make them valuable one day. But whereas today, the typical
bit of new imported amateur radio gear will depreciate like a
new car, the prices of this old wireless stuff are behaving
like that of houses.
There's already quite a thriving community of folk actually
using this old stuff, with suitable mods to make it conform
to modern standards, and a T1154 crystal controlled can still
put out quite a potent clean signal. The balancing act of retaining
originality to preserve re-sale price, and modifying to make
usable, is sometimes difficult to perform.