Since the ejector mechanism on your gun was patented just a couple years before the patenting and implementation of the Parker ejector mechanism. And also the gun was built just before the Parker mechanism, this gun was either fitted at time of manufacture by a third party or aftermarket by a separate company for the owner of the gun.

I do not know by what exact means Parker would have fitted outside parts like ejectors and single triggers when a guy was being built if a customer wanted the features before Parker offered them themselves.

A few observations on your forend. The ejector hammer and spring setup is similar to that of the Fox ejector system.
Also, if you look at the front side of the hammer cutout in the forend, it looks like it has part of the milling in it that would be in a factory Parker iron for the ejector hammers. That along with the shape of the iron, which is an ejector only iron would suggest that a factory Parker iron was modified for using this design.
This would also suggest that the iron may not be original to the gun. Since it was built in 1900 and the Parker ejector iron was not implemented until 1901. ???

The Parker ejector system was designed and patented by King and Hayes in 1901 and Parjer stuck with that design until the end of production.
Hayes did design a prototype design for an improved ejector mechanism in the late 1920s, which was basically very similar to the regular Parker design, but with cool springs. The new design was fitted to at least 2 guns that we know of. One owned by Charlie Parker (story goes that Delgrego tossed it out) and the Prototype Trojan that is in the Remington Museum. Not the Trojan skeet gun, that gun has the typical type Parker ejectors in it. Just a different forend latch.

No I do not have a letter for the gun but I would like to send away for one as soon as i get my PGCA membership.
I am VERY curious as to who the gun was originally sold to.
Even if the gun belonged to Fischer it seems mighty brave to experiment with a higher grade gun.

Can you please post a photo of the knuckle of the frame and also of the breech end of the barrels?

I want to see what else is done to this gun by way of shell kickers and also confirm if the frame has factory ejector trips or not.

A few more pics

Sorry heres the pics

This appears to be very much a prototype as the fine finishing is not done as would be if it were a factory modification. Even the wood of the fore end is broken as the coil springs dont fit into the shape of the forend itself.

In a record book that my gunsmith has this gun is recorded as just an extractor gun when it left the factory.

Yes, and looking at the gun itself, it is clear that is left the factory as an extra for gun. So the ejector iron was acquired after the fact and then modified.

The forend iron, by my observation, is the original extractor iron stamped with the original serial number and overstamped with the Fischer patent stamp. If you enlarge the image to its max you can see the side plates housing the ejector mechanism were added on evidenced by the seam line between the side plates and the original iron.
In my opinion this is the original extractor iron modified by the Fischer Company and, unless there is legitimate documentation to the contrary, was not done at Parker Bros. in Meriden, CT and it would be a mistake to assume otherwise.

good catch on that added material on the sides of the iron. Could not see that well on my phone, but now that i am looking on the big screen, I see it well.

Does anyone out there (maybe Mr. Noreen) if there there is any connection between this design and the later AH Fox design?