Doubt it’s a kit – looks like an antique that’s been round the block a few times. Not top quality machining, so perhaps made in a Victorian Brass Foundry in someone’s spare time using simple equipment.
Hard to date. Have a look at the screws – hand-made, inch-sized, and not Whitworth suggest early.
Dunno what to recommend – I like to retain the history, others might restore to ‘as new’.
Dave