Help identifying window manufacturer

[noobdiyer]

Hi all,

Just got my first home with the missus and starting to refurb.

There are some double glazed patio doors and windows installed, but they don't seem to have any identifying markings on them. The previous owner also doesn't know where they're from as they've been there since before they moved in.

The only marking is an "f" like symbol on the keys - can anyone recognise it?

View media item 34598
Thanks!
Raj

 

[crank39]

What are you trying to find out, the make of lock or the make of frame?

To me that just looks like a 'Yale' style key and at a guess is to lock your patio door? Is it a new lock your after?.........If so take a pic of the lock itself and i'll tell you what you need/want...............likewise if its the frame you need then we can't tell what make it is with a picture of a key