I'm 95% certain that '73 was the year I tried (and failed) to raise £110 to buy a late fifties or early sixties (I think it was either a '59 or a '61) Gibson 330 that was in the window at Coventry Music Centre.
In 1974 I paid £150 or so for a brand new (but shop-soiled) Guild D35.
My fave in the auction was the '1950s' Gibson Les Paul which was a 1980s with a Kahler fitted (yuk) that we sold to him from Giffins in about 1986.
£3700 seems a lot for 1973. The following year I remember seeing Slashbone Wish at Peeortsmouth Guildhall and Andy Powell was using his one as a spare for his 1967.
I remember a 1959 standard in Rhodes music in about 1979 for £2600 and I thought they would never get that much!
Bernie Marsden was using his standard at Wembley as a spare and the Sid Poole as a main guitar.
I once missed a G-brand 6120 with a P90 in the front à la Eddie Cochran for £475 and a late 1960s Jazzmaster with tags for £195! But then I am getting old.......