This was a good early Silverface when we acquired it.  We reverted the circuit back the classic AB763 Blackface circuit, replaced the non-original speaker with a vastly superior Warehouse W12C/S.   We also replaced the non-original mains transformer with to a UK voltage friendly replacement by Hammond (the best).  It's now a shockingly good sounding Blackfaced Deluxe Reverb.  Apart from the afore-mentioned changed speaker and mains transformer, and some expired caps, it's all original as far as we can tell, even down to the dog-eared grille cloth.  Oh and a couple of knobs are clearly not original, either.  Original footswitch. Sounds absolutely incredible.