I tried looking for a Graflex 3 Cell for my camera, what I did not expect we're the prices to be so high. The prices were out of my range, and I eventually decided to purchase a replica. What I am wondering is if the replicas are essentially like originals. Will it attach properly to my camera? Can I throw D batteries in there, put a Press 25 on it and fire it? Can I put a flash reflector on it? Will vintage extension cables work with it? Remote? Solenoid control? Does the 4.5v light behind the glass eye work? These are the questions I would like answers to before I purchase a replica.

If you really want to know, you should just buy one.

depends on the source.
https://graflex.org/helpboard/viewtopic.php?t=1608&highlight=graflex+replica
don't know if they are still in business or not, link is dead.

Yes, it seems the link is dead and that they have been reborn as The Graflex Shop. Strangely enough, even though it is still Repliflex running the site, the flashes they sell say that they do have no electronics, and as a result cannot be used as flash guns.

The replica flashes this guy sells absolutely function the same as the original.

http://romanprops.com/product/camera-flashgun/

There have been many replicas over the years however and not all of them were functional flashes.

I can tell you the reflector mount holes are not quite right, it is very difficult to put the reflector on.