Mystery Item

[Flying10uk]

I've had this pair of cast iron "brackets" kicking about in my garage for years but I've no idea what they are from or what purpose they serve. As far as I know I don't believe that they are military related but they could be from just about anything.

The "brackets" don't appear to be handed and both appear to be the same.

I did wonder if they came from a treadle sowing machine but I can't really see from what part.

Many thanks for any suggestions.