Nothing interesting at home, but where I work is loaded with old tech- stuff like:
Neumann microphones: U47 (introduced 1949, ours is from before the 1956 redesign), M49 (introduced 1952), KM54 (introduced 1954)
AKG C-12 (produced 1953-1963)
RCA 77DX (produced ca. 1944-1974)
Ampex ATR-102 analog tape machines (produced 1976-ca.1980 and still one of the best mixdown machines around).
Teletronix LA-2A, Gates Sta-Level, RCA BA-6B, Fairchild 670 (these are all tube compressor/limiters from the mid-'50s to early '60s).
We even have a limiter which was manufactured by Wilcox-Gay for the Civil Aeronautics Administration which I fixed up for studio use. Judging from the components and construction techniques it was probably built in the late '40s to early '50s. Since the CAA was replaced by the FAA in 1958, it can't be any newer than that.
The prices some of this gear command today are surprising. The Neumann U47 retailed for $360 US in 1960 (equivalent to about $2500 today); nowadays they can fetch 10 grand on the vintage equipment market. A C-12 in good condition can bring $12,000, and that Fairchild 670 is worth $25,000-$30,000.