I acquired a 1938 basket case Flyer some time ago which had an Enots pump which sounds very similar to the one you refer to. It is almost a complete copy of a Pilgrim pump to the extent that Pilgrim would have been justified in taking legal proceedings for passing off. Overall the Enots pump gives the impression of being a little more robust than a pilgrim and perhaps a little more modern. I had assumed that it was an after-market replacement and intended to rebuild the bike using a pilgrim pump – I haven’t had the oportunity to see it in operation, of course. But, your post has made me think.