Need help with ID 7x15 Lefauchet headstamps

I have two 7x15 Lefauchet cases with headstamps G 7 and GT. First could be made by SFM, but I am not sure. I have no idea about the second headstamp GT. Please, help me to identify this headstamps

First one is definitely SFM, came in a box that looked like this:

I am not sure what the second one is. I looked in my headstamp guide too and it was not listed.

Also, “Lefaucheux” is the correct spelling of these rather than “Lefauchet.” It refers to the Inventor of the pinfire system, Casimir Lefaucheux.

Thank you very much for your comments!

No any info about ‘GT’?