7mm Pinfire Belgian Falling Block Pistol

An interesting Belgian proofed Falling Block pistol in 7mm Pinfire.
The front and and rear of the trigger-guard are squeezed with thumb and finger to open. Then you pull the guard down to drop the breech-block.
Various views showing open and closed positions.


Nice pistol, see the belgium proofmarks on it, but see also an other stamp on the left side on the barrel …
Can you detail it .

It looks like a square with a crown over HD. Photo tomorrow if needed.

Yes please a picture would be welcome

The proof marks. Looks like a crown over HD.