Correct speedometer model for a '48 ES2

Evening everyone,

Anyone know the speedometer model number for a '48 ES2? My spares list shows : B2/545

I am assuming it's a Smith's speedo?

I have a 1948 Model 18 and that has a Smiths speedo, the one that reads basically backwards! I am lead to believe they were an option in those days and you paid extra for one.

Give Norvil a ring that guy there is a walking encyclopedia and a really nice guy,if he does not know nobody will.