This is the first I have seen a side lever directly operating from the hingepin. Is this unusual or have other mgfrs used this system?

https://www.gunsinternational.com/g...inal-condition.cfm?gun_id=101708770#lg-5

It is the Dougall lockfast. A strong lock-up at the time, but a little cumbersome to us and eventually replaced. Here's a write-up Lockfast.

Ken