The auctioneer surely knows everything about it!
I knew a man who had as a job to know everything about glass from early Rome untill the twenties.
He did nothing else his whole life.
He was the only one in Berlin.
Now a days we have specialists for everything, and via the auctioneer you have surely the connection to one of the three or ten British guys who know it for sure what is this exactly.
So long he offers this he will take the time to help you I guess.
Ask him!
An other way would be the best British museum with a historic tool collection.
Or the best German museum for stuff like that.
Just call a museum and ask them who has the best collection. Than you ask the best museum, and there will answer the best British or German specialist.
They usually do not tell you prices, but they tell you every thing else. It is theyr job to do that and theyr passion!
(prices are unsure, the auction gives the current market price)
If you obviously have something interesting like this axe here, you can do it without any problem.
The guys in the museums love to speak about theyr stuff like we about tarps and tents.
But they have studied it and do it on a higher level, let's say they are the most insane ones who run around.
And of course they answer, because with a very high chance they will get the really interesting stuff earlier or later for the own collection, should it belong there.
Buy telling you what it is, they protect the stuff, and that's theyr job. They are hired to do it. And they do it for free.
And in in the end they get a lot of the stuff for free for the official museums collection, because the idealistic worth of it usually is much higher than the price on the market. Not so many people collect historic stuff privately. That keeps the prices low.
If people own historic stuff, they often gift it to a larger or smaller lokal museum, where it mainly belongs to.
That's simply the way how civilized people treat their national heritage:
Private and official collections!
Most times the private collection is giftet in the end to the museum.