Help identifying discrete op amps

[Seeker]

I have a few of these that came in a 312 pre I bought some time ago from a group diy member… I recently built some gar2520 that I swapped for these. I’ve looked but I can’t find any labels or markings on these, anyone recognize the layout?

Thanks

 

[emrr]

Might be the Peter Purpose layout

 

[Seeker]

Thanks Doug!

 

[Walrus]

It's extremely close to the latest Peter Purpose LAZ25 layout I'm familiar with, but there are minor differences.
The only other time I have seen the letters LBG on a 2520 were the very early (2005) incorrect versions.