MuswellMetro
Queen Bee
Maybe its an adaptation of a Smith or Langstroth floor to National size ?
I am thinking TBS versus BBS..
Admin, that's what i suspect as i have never seen a 6mm riser floor before (4mm on mine l've, just measure it as i have rushed up to my hives with asuper)
sorry if ihave posted too long and perhaps personal views, but, i did work on the 1970 revision of the BS national...if only as a typist, ..i am that old
![Biggrinjester :biggrinjester: :biggrinjester:](https://www.beekeepingforum.co.uk/images/smilies/biggrinjester.gif)
i think it was 9d for the leaflet, and as expensiveas half a pint of Beer...1/9 for a pint of Flower's KEG
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