The Parker catalog from the 50's on the Chris Keene site that talks about private label pipes, much earlier than the "one and a half years" stated in the 77 catalog. I have what is almost certainly a Parker private label with a quality, hand cut vulcanite stem, so they are out there. My pipe takes a Dunhill inner tube, is not a Dunhill, and is an extraordinary smoke.
The price does seem a wee bit optimistic, to say the least.
Doc