Paxman genset frequency meter/gauge

Hello,
We are looking for a frequency meter for our Paxman RQ genset like the one in the picture.
The second one from the right.
It is about 6 inch in diameter. possibly BTH or Isenthal??
Thanks.

Hi, Afraid I can't help with the meter but it's good finding someone else with a Paxman RQ. An interesting design , a  friend of mine has one with a 3 phase generator that he  used to power his woodworking machinery and carpentry shop - it has a canopy and is a very heavy lump.