They are genuine green and yellow BBC discs. I presume mono as I found 14 in all and just one has a "stereo" stamp to it. The remainder are easy listening and spoken word (Navy Lark and I'm Sorry I'll Read That Again.) As a side note they appear to be Decca pressings as they have the distinctive Decca deep groove. They were all stuffed sleeveless between a sheet of bubble wrap in an ancient battered vinyl carry case!