Any HP Hampden experts out there?

Evening,

I picked up this piece on my travels – pretty sure it is HP Hampden with the HP inspectors mark and the part number commencing with 52.

However, can anyone identify what the part actually is please?

Many thanks
TEC

[ATTACH=CONFIG]248624[/ATTACH][ATTACH=CONFIG]248625[/ATTACH]

[ATTACH=CONFIG]248628[/ATTACH]

[ATTACH=CONFIG]248626[/ATTACH][ATTACH=CONFIG]248627[/ATTACH]