A Mystery Helmet

Can you identify this Helmet?

The picture below is of what appears at first glance to be an AVC Helmet, but when you take a closer look you can see detail differences.

Such as:
- 5 press studs on the leather cheek pieces,
- Velcro over the forard area, where something attaches.
- Firm padding inside.
- Large slotted bolts along sides.
- Pivot/attachment point at lower front sides.

The most noticeable of these being what appears to be a leather suspension liner instead of the normal "mesh and padding".

The helmet was offered on ebay and no details were provided. I cannot follow up on where it came from or who bought it.

Can you offer any suggestions?