You are looking at pair of super rare Lancroft audio single ended output transformers and matching interstage transformers.
These transformers were custom wound by bob a few years ago! he no longer winds, so these are kinda pretty rare!
the primary of the outputs are 5k for single ended and the interstage can be configured, i think i still have a diagram somewhere.
These things are huge! the pictures do not show you the scale well, the interstage are as big as most 300b outputs.
You could use these for a single 300b, kt 120, they were designed to be used with two parallel 845 tubes, so good for up to 50 watts.
multiple outs on the outputs, i think they were 5 9 and 16 ohms, bob has all the details
better than any tamura or tango i would say! built here in Aus with the best materials available, i am gutted to be selling these, but i need to raise funds for another project, my price of $1200 is firm
i will send these interstate, but would prefer local pick up
cheers gary