Following on from Jonty Semper's field recording single of a commemorative silence, a seven-inch of complete silence, of nothing, dated 1976 - one of the more obscure releases on the label (Beserkley; number : B-5746) which brought us Jonathan Richman, Earth Quake, The Rubinoos and Greg Kihn. A U.S. issue I found in a charity shop years ago and bought for the Jonathan connection ("remix" was by Glen Kolotkin, Jonathan's producer), not suspecting it was silent. This 45, arranged by one R. Bimber and with production by Tom Lubin (http://tomlubin.blogspot.com), came in a b&w picture sleeve with the same image printed on both sides - an illustration of a knight (chess piece, i.e.) in the snow, with an icicle hanging from its snout. The lettering is seasonally snow-capped. I guess this was put out as a joke Christmas gift. Interestingly, the silent flipside, Disco Party, Part 2 clocks in at two seconds longer, at 3:01. (On the Marcel Marceao (sic) L.P., however, both sides are exactly the same - one can tell from the matrix number; the applause at the end of each otherwise silent side should have been different, really, to eliminate the possibility of the record's slightly shoddy feel.) Son Of Pete was Beserkley Records' founder, Matthew "King" Kaufman, who was also Rose Bimler (http://en.wikipedia.org/wiki/Matthew_King_Kaufman).
My copy of Silent Knight is in pretty nice condition - how often would its previous owner have needed to play it ? With numerous listens and the right degree of carelessness, neglect in sleeving the disc immediately after hearing it, the "silence" would eventually have scratches and scuff sounds superimposed upon it. The "silence" is already compromised a little by the pressing process, the inevitable bit of crackle which is usually drowned out by music but which is all too apparent on this record.
I'm not certain how many other singles of complete silence were made, though I've knowledge of one for use in conjunction with jukeboxes, to provide three (?) minutes' respite from constant sound (on Hush Records). There was a silent record on sale in the Grot shop (a business venture deliberately designed to fail spectacularly), in the BBC Television series The Rise And Fall Of Reginald Perrin, though, alas, said record was never marketed as a cash-in.