The 'Pufango' engines were built in the UK by Tony Wright to his own design. He made a lot of different types in small quantities and as far as I know this is his only Beam model. I think some of his designs were published in the Model Engineer magazine.
I say 'made' as I don't know if he is still active, I have one of his Beam engines with that unusual porting arrangement whereby the cylinder rotates to let steam in and out, came with a copper boiler and it's a good runner.
Dave