Lister H2 & H3 Pumps

Hi all, I have aquired a Lister H2 pump and my son has aquired a H3. The H2 has no detail plate and the H3 is difficult to read. Does anyone have a photo of a detail plate that I may be able to use to help decipher this one. Also does anyone know what years the H2 and H3 were manufactured between, and is there any specific differences between the two other than the style of the brass plugs?
Thanks in advance.
Stuart.

This is a handy booklet to have

https://www.ebay.co.uk/itm/Lister-Shallow-Well-Pumps-Spray-Pumps-Book-Lister-Water-Pump-Sales-Booklet/372471931871?

Thanks, I've already ordered from Stationary Engine Spares I thought it would be useful. Just the ages I'm struggling with, I'm new to this and have no idea about the pumps.

Just sold mine , but this was the spec plate on it.



The H1, H2 and H3 pumps were manufactured at the same time with the H3 having a larger capacity.
Mine was an H2H which means high pressure, you can also get a H2L for normal pumping duties.

Sorry for the delay, been away for a while. Thanks for the info, much appreciated.
Stuart.