The only numbers are the length of the channels

Hello! I agree, our Series 770 looks like a great match. Your pivot shoe may be a match for our 15-129, but you'll have to compare your dimensions to ours to confirm that they line up.

I'm afraid the provided information doesn't tell me if our Series 770 will work for you. All I can tell you is that the given stamp is pretty peculiar for this configuration.

Your first step should be to carefully review the photos we show for the Series 770 on its store page. That should tell you if it's the same design as your existing hardware.

If not, or if you aren't sure, then we will need photos.