Help Identifying my Randall

I have a Randall knife model 3-6. I have no idea what it's worth. I have scoured the internet looking for a similar knife but have come up empty. The handle appears to be ivory and black macarta striped with brass hilt and butt cap.

It's a rehandled model 3, probably worth about $300 or so. Sheath appears to be a Johnson smoothback.

Thanks! do you know about what year it was made?