Hello Tony,
This is very interesting as though I knew the rist had been mounted to the head, I didn't realise the benjamin had too. With this in mind a couple of days ago when this benjamin popped up on ebay (LINK), I was intrigued to see the bracket more known for the rist (which would mount to the cylinder head). Picture below...
s-l500.jpg (Size: 21.55 KB / Downloads: 187)
This sounds like what you have on your '29 Tony, so this 'could' be an original head mounted benjamin?
This is very interesting as though I knew the rist had been mounted to the head, I didn't realise the benjamin had too. With this in mind a couple of days ago when this benjamin popped up on ebay (LINK), I was intrigued to see the bracket more known for the rist (which would mount to the cylinder head). Picture below...
s-l500.jpg (Size: 21.55 KB / Downloads: 187)
This sounds like what you have on your '29 Tony, so this 'could' be an original head mounted benjamin?