Later in Macdonald Hastings book along with a picture of the Purdey it states.
"In 1870-the date is arguable- Purdey introduced this double-barreled 12 bore pinfire gun. It's importance is that this seems to be the earliest model showing the top lever and sliding bolt action which is basically the Purdey gun today. Collectors should be very carefull in assigning diffinitive years to improvements. The Purdey action is incorporated in a later patent (no.397 of January 1878) and described again in Beesley's patent of 1880".
I took this as saying Purdey made the succesful model that has survived today.
To me first doesn't matter it's the guy that perfected something....all those other designs fell to the way side
The Purdey bolt action (top lever double under bolt) has survived.
Would it be fair to say "the son of Purdey the first was the first to perfect the top lever and double under bolt".