I recently purchased a WW Greener FH25 at an online auction, when I received it I found it had a single selective trigger. The serial number puts the date of manufacture between 1915-1920. I have not been able to find any information on the web about single trigger guns. Does anyone on here have any information about the single trigger? Is there anything I need to be careful of? I would post pictures but don't have a website to link to. Any information would be appreciated, thanks in advance.

Are you sure who made the trigger? Many guns have had after market single triggers added over the years. Some of the Early English Single triggers were non-selective, I had one of those that was mechanical and it worked flawlessly. I have never seen a Greener with a single trigger before myself. You can email me a couple of photos to post for you, my address is in my profile.

jaf1223,

Harry Greener, son of W.W. Greener had single trigger patents. They are fully described
in The British Shotgun Volume III by Crudgington & Baker.

Thank you SKB for posting the pictures and for the description of the trigger. Any other information would be appreciated. I wonder if the selective trigger had problems, and that is why you don't see them?

This is a gross generalisation but single triggers on conventionally stocked vintage guns are a bit of a nightmare. I have dealt with enough (it didn't take many!) to avoid them like the plague now.
The problem can often be traced to poor restocking or shrinkage/swelling of the wood or simply bad gunsmithing sometime in the gun's past.
Of course they did all work once upon a time and most Boss single triggers still do (subject to the comments above) but they are usually a plumbers nightmare of tiny parts that can easily go out of timing.
Greener used the pendulum design which has been refined by every OU manufacturer for over a century and is now almost totally reliable but the same can not be said of many others.

So now that I have one, is there any special maintenance/cleaning I need to do to keep it functioning properly?

Don't over oil, don't tinker and pray to the Gods of the single trigger that you have a good one!
And if, or when, it stops working as designed ONLY give it to someone with the knowledge and experience to fix it!
In your case, it is going to be a very small number of very experienced Greener gunsmiths!

OK, thanks for the advice. I'll start praying.